Explanation:

- "Bang for the buck" is an idiom that originally refers to getting the most value or benefit for the money spent. It's about maximizing efficiency and getting good deals.

- Option 1: More value for money

- This option aligns perfectly with the idiom. It means getting good returns or benefits in relation to what is spent.

- This is the correct answer.

- Option 2: Less value for money

- This means not getting enough benefits for what you spend, the opposite of the idiom.

- Option 3: A sorrowful heart

- This is unrelated to the idiom. It refers to someone feeling sad or heartbroken.

- Option 4: Dash against something

- This option means colliding with something, and doesn’t capture the financial or value-related sense of the idiom.