Which of the following process helps the trichomes in preventing wa...

Which of the following process helps the trichomes in preventing water loss?

A. Companion cells help in maintaining the pressure gradient in the sieve tubes

B. Plants absorb water through the roots and give off water vapour through pores in their leaves

C. Activity of cork cambium builds pressure on the remaining layers peripheral to phellogen and ultimately these layers die and slough off

D. Trichomes form a protective covering reducing transpiration from epidermis