What is 2,4D primarily used for?

2,4-Dichlorophenoxyacetic acid, commonly known as 2,4-D, is primarily used for controlling broadleaf weeds in a variety of settings, including agricultural fields, lawns, and pastures. It works by mimicking natural plant hormones (auxins), which leads to uncontrolled growth in susceptible broadleaf plants, ultimately causing their death. This selectivity allows crops like corn, wheat, and grasses to thrive while effectively managing unwanted broadleaf weed populations.

The reason other options do not represent the primary use of 2,4-D is that it is not intended for killing grasses; in fact, it is formulated to spare grass species while targeting broadleaf plants. Promoting flower growth and enhancing soil quality are not functions associated with 2,4-D; it is a herbicide rather than a fertilizer or soil amendment. Therefore, focusing on its function as a broadleaf weed control agent accurately reflects its primary application in agriculture and landscaping.