Could you explain this question please?

Dear Student, Double Fertilisation is an unique phenomenon of Flowering plants (Angiosperms). So, here assertion is correct as two fertilisations occur in Angiosperms, one of male gamet(sperm) with female gamet(ovum) while another between male gamet and polar nuclie(two in number). The fusion of male gamet with two polar nuclie is known as triple fusion. So, Reason is incorrect as triple fusion occurs only in one fertilisation out of two fertilisations. Here, Assertion is correct while Reason is wrong. Regards.