Explanation:

Introduction:
The question asks about the amount of money in the wallet, and we need to choose the correct option from the given choices. Let's analyze each option to determine the correct answer.

Analysis of options:

a) Many:
The word "many" is used to describe countable nouns. Since money is not countable, we cannot use "many" in this context. Therefore, option 'a' is not the correct answer.

b) Much:
The word "much" is used to describe uncountable nouns. Money is an uncountable noun, but it is not used to describe the quantity of money. Therefore, option 'b' is not the correct answer.

c) A little:
The phrase "a little" is used to describe a small amount of something. It implies that there is some money in the wallet, but the amount is not specified. This option is a possibility, but it is not the best answer because it does not give a specific amount.

d) Some:
The word "some" is used to describe an unspecified quantity or amount of something. It is a general term that can be used for both countable and uncountable nouns. In this context, using "some" implies that there is an unspecified amount of money in the wallet. This option is the best answer because it is the most suitable and accurate description of the amount of money in the wallet.

Conclusion:
Based on the analysis of each option, option 'd' (some) is the correct answer. It accurately describes the presence of money in the wallet without specifying the exact amount.

"Some" is used for both countable and uncountable nouns in positive statements. It indicates that there is a certain amount of money in the wallet.