An especially important factor in the evolutionary origin of flowering plants was the ability to...?

Please answer these questions with explanation.  Thanks!

An especially important factor in the evolutionary origin of flowering plants was the ability to
a)conduct water and other materials in specialized tissues
b)control transpiration by means of guard cells
c)form symbiotic relationships between roots and fungi
d)provide a watery pathway for the swimming sperm
e)transfer pollen over long distances in dry air

A flower generally considered to be advanced might have any of the following characteristics except
a)corolla irregularly bilaterally symmetrical
b)numerous spirally arranged stamens
c)petals fused with sepals
d)petals fused with each other to form a tube
e)sepals fused with each other to form a tube

In flowering plants, meiosis occurs specifically in the
a)megaspore mother cells
b)microspore mother cells
c)endosperm
d)only A and B are correct
e)A, B, C are correct