Comprehension:
In the following passage, some words have been deleted. Read the passage carefully and select the most appropriate option to fill in each blank.
The rise in the Irrawaddy dolphin (1) _______ in Chilika can be attributed to the eviction of (2)  _______ fish enclosures.After thousands of hectares of Chilika lake were made (3) _______ free, Irrawaddy dolphins found unobstructed area for movement. (4) _______, due to the COVID-19
lockdown last year, there were comparatively fewer tourist boats on Chilika lake, which made it (5) _______ for dolphins to move from one part of the lake to another.

Select the most appropriate option to fill in blank no. 4.

The correct option is Moreover.

Step-by-step explanation:
1. Analyze the context: The passage discusses the factors contributing to the rise and ease of movement of Irrawaddy dolphins in Chilika Lake.
2. Identify the relationship between ideas:
- The sentence preceding blank (4) states a primary reason: the eviction of fish enclosures, which cleared thousands of hectares of the lake and provided an unobstructed area for dolphins to move.
- The sentence following blank (4) introduces another supporting reason: the COVID-19 lockdown, which resulted in fewer tourist boats and made it easier for dolphins to move from one part of the lake to another.
3. Evaluate the transition words:
- Moreover: Used to introduce an additional, supporting fact or argument that aligns with the previous statement. This fits perfectly since it adds a second positive factor (fewer tourist boats) to the first one (eviction of enclosures).
- Whereas: Used to compare or contrast two different facts or ideas (e.g., "She likes tea, whereas he prefers coffee"). This is incorrect here.
- Nevertheless / However: Used to show contrast or concession (e.g., "It was raining; however, they went for a walk"). Since the second point supports and adds to the first point rather than contradicting it, these contrast transition words are incorrect.
4. Therefore, Moreover is the most appropriate word to logically connect the two sentences.