What pesticide controls mites, scorpions, spiders, ticks, and related organisms?

The correct answer is acaracide, which is specifically designed to target arachnids, including mites, scorpions, spiders, and ticks. Acaracides work by interfering with the nervous system or other biological functions of these pests, effectively controlling their populations and preventing infestations. This makes acaracide the most suitable choice for controlling the specific organisms mentioned in the question.

Insecticides are aimed at a broader category of pests, primarily insects, and while they may have some effect on certain arachnids, they are not as effective or targeted as acaracides. Herbicides are designed to control plant growth by targeting weeds and are not relevant to the control of arachnids. The term pesticide is a general category that includes acaricides, insecticides, and herbicides, but it does not specifically denote the targeted action against mites and similar organisms. Therefore, acaracide is the most appropriate choice for the given context.