The correct option is 1. Neither conclusion I nor II is correct. I. Only the Earth revolves round the Sun → It is not given that only earth revolves around sun. Other planets might also be revolving. Thus, conclusion I is nottrue. II. The Sun does not revolve round the Earth but the other planets → Nothing is mentioned about the revolution of the sun around other planets. Thus,conclusion II is not true. Hence none of the given conclusion is true.