Question

the foremost drug that has been the cause of increased drugged driving...
a. is marijuana.

b. are opioids.

c. is cocaine.

Explanation:

To determine the correct answer, we analyze the context of drugged driving. Marijuana is a commonly associated drug with increased drugged driving cases due to its prevalence and effects on motor skills. Opioids (option B) is plural and the subject "drug" is singular, so subject - verb agreement is incorrect. Cocaine (option C) is less commonly the foremost cause of increased drugged driving compared to marijuana in many regions and studies.

Answer:

A. is marijuana.