The Fact That Early Diverging Angiosperms with Vessels Did Not

The fact that early diverging angiosperms with vessels did not conduct water at higher rates than early diverging angiosperms that lacked vessels supports the hypothesis that:

A) differences in xylem structure relative to gymnosperms did not contribute in an important way to the success of early angiosperms.
B) the change in angiosperms from wood composed of tracheids to wood composed of vessels and fibers did not have much evolutionary impact on angiosperms until the diversification of monocots and eudicots.
C) the growth-form flexibility conferred by xylem with fibers was more important for the ecological success of early angiosperms than the potentially high rates of transpiration made possible by vessels.
D) angiosperms first evolved under shady and moist conditions.