The correct option is
A Protection and reduction of transpiration
Trichomes are the multicellular hair like structure present mostly on stem and leaves originate from the epidermal layer.
The function of trichomes:-
- They are glandular.
- Protects the plant from sunlight and outer injuries.
- Prevent plant from water loss.
- helps plant in defense against insects.
So the correct option is 'Protection and reduction of transpiration'.