Asecondary plant compound might be used for which of the following?
a new crop variety
a new drug
a soil nutrient
a crop pest

The correct answer is option -  a new drug.

Explanation:

Secondary metabolites or compounds are chemicals that are produced by plants and are not directly essential for plant life function such as development or reproduction. They perform several beneficial functions and are used as pigment, anti-grazing agent, and hormones. Some secondary metabolites have medicinal value. Secondary compounds are also perform alleleopathic activities as they attack other plants.

The secondary metabolites are used to form drugs and pesticides. Asafoetida is a secondary metabolite and use as medicine because of its medicinal value.

Thus, the correct answer is option - a new drug.