In the study of biology, how are the angiosperm families classified within the broader category of angiosperms?
a) Angiosperm families are classified based on their genetic material and are unrelated to the evolutionary history of angiosperms.
b) Angiosperm families are grouped according to their reproductive structures and the presence of vascular tissues.
c) Angiosperm families are categorized by their geographic distribution and the size of their seed coats.
d) Angiosperm families are classified based on their ability to photosynthesize and their method of seed dispersal.