Read the passage carefully and answer the question that follows.

Water shortages are increasingly shaping public health, livelihoods, and social stability across many regions. Although the planet contains abundant water, safe and affordable supplies are unevenly distributed. In many lower-income communities, families face dry taps or polluted sources while wealthier neighbourhoods and powerful users receive more reliable access. This imbalance is not merely the result of weather patterns; it is reinforced by decisions about investment, ownership, and political influence.

Efforts to address the problem often move slowly because influential agricultural, industrial, and energy groups oppose changes that could limit their access. Methods such as collecting rainwater and converting seawater can help in particular places, but they cannot by themselves ensure fair distribution. Lasting water security requires accountable public institutions, open decision-making, and policies that regard water as a shared necessity rather than a product reserved for those with greater power or wealth.

According to the passage, what lies at the heart of the water crisis?

Correct Answer: Economic and political arrangements deny dependable water access to disadvantaged groups.

Step-by-Step Explanation:

1. Analyze the Passage:
The passage emphasizes that water shortages and uneven distribution are not simply caused by natural weather patterns. It points out that in lower-income communities, families face dry taps or polluted water, while wealthier neighborhoods and powerful users receive reliable access. The text explicitly attributes this imbalance to "decisions about investment, ownership, and political influence."

2. Identify the Root Cause:
According to the text, efforts to fix the water crisis move slowly because influential agricultural, industrial, and energy groups resist changes. Therefore, lasting water security is blocked by unequal economic and political structures that favor wealthy or powerful entities over disadvantaged communities.

3. Evaluate the Options:
- Worldwide rainfall has declined so sharply...: Incorrect. The passage states that the planet contains abundant water and that weather patterns are not the sole cause.
- Factories alone consume all available water supplies: Incorrect. The passage mentions agricultural, industrial, and energy groups, but does not state factories alone consume all water.
- Economic and political arrangements deny dependable water access to disadvantaged groups: Correct. This directly matches the passage's explanation of how investment, ownership, and political power dictate water access.
- There are no practical technologies...: Incorrect. The passage mentions collecting rainwater and converting seawater as existing practical methods.

Thus, the core issue of the water crisis is that economic and political arrangements deny dependable water access to disadvantaged groups.