In this question, the assertion (A) is that compared with proteins and fats, carbohydrates are more suitable for the production of energy in the human body. The reason (R) given to support this assertion is that carbohydrate molecules contain relatively more oxygen compared to proteins and fats.

Option 1 states that both the assertion and the reason are true, and that the reason is the correct explanation of the assertion. This means that both A and R are correct, and R provides a valid explanation for why carbohydrates are more suitable for energy production.

Option 2 states that both A and R are true, but R is not a correct explanation of A. This means that while both statements are true, the reason given is not the correct explanation for why carbohydrates are more suitable for energy production.

Option 3 states that A is true, but R is false. This means that the assertion is true, but the reason given to support it is incorrect.

Option 4 states that A is false, but R is true. This means that the assertion is false, but the reason given to support it is true.

In this case, the correct answer is option 1, where both A and R are true and R is the correct explanation of A. Carbohydrates are indeed