Arid Plants That Can Minimise Water Loss and Maximise the Assimilation

Arid plants that can minimise water loss and maximise the assimilation of CO₂ would typically

A) be able to have their stoma partially open during the day to conserve water without greatly reducing photosynthesis.
B) have their stoma open at midday, even in the hottest months of the year.
C) have leaves unresponsive to root signals relating to soil dryness.
D) not limit water loss at the expense of carbon gain.
E) not open their stoma during the day, but continue photosynthesis.