Which Statements Are Likely to Have Been TRUE of the Earliest

Which statements are likely to have been TRUE of the earliest angiosperms?

A) The presence of vessels allowed them to form a tall, emergent layer in tropical forests.
B) The evolutionary innovation of flowers allowed them to be much more diverse than other seed plants radiating at this time.
C) Animal pollination made possible by flowers allowed them to survive at low density in tropical forest understories.
D) They evolved in shady and wet conditions, growing toward the side to exploit light gaps in the canopy overhead.