stems curling in response to touch stems swelling in response to water flowers opening in response to light roots growing in response to gravity
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: A morning glory is a type of flowering vine that climbs trees and fences. Which of the following behaviors most helps a morning glory plant climb a fence?
Possibilities:
- stems curling in response to touch
- stems swelling in response to water
- flowers opening in response to light
- roots growing in response to gravity

stems curling in response to touch