Option 1: Both the statements are individually true and statement II is the correct explanation of statement I.

This option suggests that both statement I and statement II are true, and that statement II is the correct explanation for statement I. However, this is incorrect. While statement II is true, it does not explain why comets revolve around the Sun in long elliptical orbits.

Option 2: Both the statements are individually true but statement II is not the correct explanation of statement I.

This option is correct. It acknowledges that both statement I and statement II are true. Comets do indeed revolve around the Sun in long elliptical orbits, and they do develop a tail when they get close to the Sun. However, the development of the tail is not the reason why comets have elliptical orbits.

Option 3: Statement I is true but statement II is false.

This option is incorrect. Statement I is true, as comets do revolve around the Sun in long elliptical orbits. Statement II is also true, as comets do develop a tail when they get close to the Sun.

Option 4: Statement I is false but statement II is true.

This option is correct. Statement I is false because comets do not revolve around the Sun