The word "heliotropic" mean in this context, "plants that thrive in full sun" (option B).
Heliotropism is a plant characteristic or process characterized by seasonal or daily motions of plants toward the sun. These motions are intended to provide more sunshine to the plant at times of low light.
These plants exhibit these plant motions in order to obtain more sunlight for growth and development. The sunflower is a large flower that is an example of heliotropism.
The heliotropism of the sunflower demonstrates its need for additional energy and the ability to do photosynthesis. They migrate towards the sun to undertake photosynthesis in order to generate more energy.
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