In asexual reproduction, the cells of parent organisms divide by mitosis to form identical cells. There is no change in DNA. Hence, no variations occur. Also, gametes do not play any role because this will bring new re-combinations of traits and it occurs only in sexual reproduction. Thus, (1), (3) and (4) are all incorrect about asexual reproduction.
But as we know, spore formation is one of the methods of asexual reproduction. We can say that (2) is the most suitable answer.