Ethylene Affects Plant Growth by Reacting with a Receptor Which

Ethylene affects plant growth by reacting with a receptor which is located in the

A) nucleus, where it directly activates transcription factors.
B) plasma membrane where dimerisation causes autophosphorylation to initiate a signal transduction pathway.
C) intracellular as the ethylene may diffuse through the plasma membrane.
D) fruit, where it initiates ripening.
E) cytosol where it causes increased respiration.