The three most commonly applied pesticide groups are: a) herbicides, miticides, fungicides; b) herbicides, insecticides, repellents; c) herbicides, insecticides, fungicides.

• A. Herbicides, Miticides, Fungicides
• B. Herbicides, Insecticides, Repellents
• C. Herbicides, Insecticides, Fungicides
• D. Insecticides, Fungicides, Miticides

Answer: (C)

The main idea here is that pesticides are grouped by what they target, and the most common targets in farming and landscaping are weeds, insects, and fungi. So the three most commonly applied groups are herbicides for weeds, insecticides for insects, and fungicides for fungal diseases. These three cover the broadest range of problems that regularly affect crops and turf, explaining why they top the list.

Choosing a set that includes miticides or repellents isn’t as representative. Miticides focus on mites and are used in more specific situations, not as universally required as insecticides. Repellents deter pests rather than directly controlling the pest populations or disease spread, so they don’t represent the primary chemical control categories used most widely. Similarly, a set that leaves out herbicides misses the essential control of weed competition, which is a central, ongoing need in most agricultural and landscape settings.

Therefore, herbicides, insecticides, and fungicides best reflect the common, broadly applied pesticide groups.