Explanation:

- Option 1: Hartley Withers

- Hartley Withers was a British journalist and author known for his writings on finance.

- The phrase "Money is what money does" is sometimes attributed to him.

- Option 2: Harte

- There is no prominent figure known as Harte associated with this quote.

- This option is likely incorrect or irrelevant to this context.

- Option 3: Prof. Thomas

- There is no widely recognized economist or philosopher named Prof. Thomas linked to this saying.

- This option does not seem to fit the context of the quote.

- Option 4: Keynes

- John Maynard Keynes was a famous economist.

- While he has insightful views on money and its functions, this particular quote is not typically attributed to him.