Answer:
A) Thigmotropism is a plant's response to touch.
B) Thigmotropism is a plant's response to an external stimulus.
D) Thigmotropism can occur quickly or slowly.
E) Thigmotropism may involve the way in which a plant grows.
F) Thigmotropism may involve the closing and opening of plant leaves.
Step-by-step explanation:
All of them except for c