Select the option that can be used as a one-word substitute for the given group of words.

Money collected from people for a cause.

The correct option is Fund.

Let's analyze the meanings of the given words to understand why "Fund" is the most appropriate one-word substitute for "Money collected from people for a cause":

1. Fund: This refers to a sum of money saved or collected for a specific purpose or cause, such as a charity, relief effort, or public project. Thus, it perfectly matches the given description.
2. Deposit: This is a sum of money placed in a bank account or paid as a first installment for a purchase or service.
3. Collection: While this refers generally to the act of gathering money or objects, it is a broad term and does not specifically denote money set aside or raised strictly for a dedicated cause in the way a "fund" does.
4. Savings: This refers to personal money that an individual saves over time, usually in a bank, for their own future use.

Hence, the term that best fits the description is Fund.