The correct answer is A. Away from.
Step-by-step explanation
Tropism is a term used to refer to the response of plants to an external stimulus directly related to their growth. The tropisms have two categories, the positive and the negative tropism, while the positive tropism refers to the growth of the plant in the direction of the external stimulus, for example, the sunlight as most the plants grow towards it. On the other hand, negative tropism refers to the growth of the plant away from the stimulus, for example, some plants feel surfaces such as walls, floors, trees, among other objects and grow away from them. So, the correct answer is A. Away from