Which of the following chemicals is specifically used to control fungi?

The correct answer is C, fungicide, because fungicides are specifically designed to target and control fungal diseases in plants and crops. These chemicals inhibit the growth of fungi or kill them outright, which is crucial for maintaining plant health and preventing damage caused by fungal infections.

In contrast, insecticides are used to control insect pests, herbicides are employed to manage unwanted plants or weeds, and pesticides is a broader term that encompasses both insecticides and herbicides, as well as fungicides. While pesticides can refer to any chemical used to control pests, only fungicides have the specific formulation targeted at fungal organisms. This specificity is essential for effective management of fungal-related issues in various agricultural and horticultural contexts.