What is the first activity to occur after fertilization happens in an angiosperm?
a). an egg cell forms
b). the seed develops
c). the pollen grain divides
d). the pollen tube begins to form

The seed develops as the ovule had already fertilize with the sperm so it cannot be C and D as those happen before fertilisation. A cannot be the answer as in an angiosperm, there is no egg, only ovules.

The best way to tell its true color is to look at the minerals streak