Auxins inhibit the growth of:

Explanation

Auxins are plant hormones that play a crucial role in regulating plant growth processes. They are primarily known for promoting the growth of the apical bud while inhibiting the growth of lateral buds, a phenomenon known as apical dominance. This is why they inhibit the growth of lateral buds, as the plant directs more resources to the elongation of the main stem. In contrast, auxins promote root growth at low concentrations and can encourage parthenocarpy in some plants. Therefore, the correct answer is that auxins inhibit the growth of lateral buds.