Which of the Following Best Explains Why Very Few CAM

Which of the following best explains why very few CAM plants are tall?

A) They have difficulty moving water and minerals to the top of the plant during the day.
B) They would be unable to supply sufficient sucrose for active transport of minerals into the roots during the day or night.
C) Transpiration occurs only at night, and this would cause a highly negative Ψ in the roots of a tall plant during the day.
D) Since the stomata are closed in the leaves, the Casparian strip is closed in the endodermis of the root.
E) With the stomata open at night, the transpiration rate would limit plant height.