Explanation:

Let’s break it down:

- National Income at Market Prices is calculated using current market values, not adjusted for inflation.

- Option 1: Money income ( Correct Answer)

- This is income measured in monetary terms, without adjusting for changes in price level.

- It’s what the national income at market prices actually means.

- Option 2: Real income

- Real income means income after adjusting for inflation, reflecting actual purchasing power.

- So, this isn’t what we’re talking about when we refer to "market prices."

- Option 3: Non-monetary income

- This refers to goods and services received without direct payment, like home-grown food, not counted here.

- National income calculations usually focus on monetary transactions.

- Option 4: None of these

- Doesn’t apply, since Option 1 is right.