Correct Answer: Option B

Explanation

Thigmotropism is a directional growth movement which occurs as a mechanosensory response to a touch stimulus. Mechanosensory responses in plants are the ways that plants move or change shape in response to touch, wind, or other mechanical stimuli. 

Phototropism is the ability of plants to grow towards or away from light, which is a vital adaptive process for plants.

Geotropism is the growth of the parts of plants in response to the force of gravity.

Hydrotropism is a plant's growth response in which the direction of growth is determined by a stimulus or gradient in water concentration. It is the growth or turning of plant roots towards or away from moisture.

There is an explanation video available below.

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