Consider the following statements:Statement-I: Giant stars live much longer than dwarf stars.Statement-II: Compared to dwarf stars, giant stars have a greater rate of nuclear reactions.Which one of the following is correct in respect of the above statements?

1. A

   Both Statement-I and Statement-II are correct and Statement- I Statement-II explains

   Both correct and II explains I. Giants burn faster and live shorter lives, not longer.

2. B

   Both Statement-I and Statement-II are correct, but Statement-II does not explain Statement-I

   Both correct but II does not explain I. Statement-I is false.

3. C

   Statement-I is correct, but Statement-II is incorrect

   I correct, II incorrect. Giants do have higher nuclear rates.

4. D

   Statement-I is incorrect, but Statement-II is correct

   I incorrect, II correct. Dwarfs live longer; giants have faster fusion.

Summary. Official key is (d). Giant stars are luminous and fuse fuel at a high rate, so they live much shorter lives than dwarf stars of lower mass. Statement-I reverses that. Statement-II is true and explains why giants die young — it does not make I true.