pollination of flowers transportation of nutrients discouraging predation responding to the environment
I gave my students this multiple choice question: Unequal distribution of the hormone auxin in plants helps to regulate the direction of plant growth. Which of the following is accomplished by plants in regulating the distribution of auxin?

Only one answer is correct among these 4 choices:
- pollination of flowers
- transportation of nutrients
- discouraging predation
- responding to the environment

Could you tell me which one is correct?

responding to the environment