Auxins: cause plants to grow away from the light

cause some plant cells to grow longer than others

are only found in flowering plants

are used to delay aging in plants

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Option B

Explanation:

Auxins promote stem elongation, inhibit growth of lateral buds (maintains apical dominance). ... Auxin is a plant hormone produced in the stem tip that promotes cell elongation. Auxin moves to the darker side of the plant, causing the cells there to grow larger than corresponding cells on the lighter side of the plant.