Question

in the united states, about one in two adults consume:
○ alcohol.
○ aspirin.
○ caffeine.
○ opiate medication.

Explanation:

Caffeine is a widely - consumed substance. Coffee, tea, energy drinks, and many soft drinks contain caffeine. In the United States, a large number of adults consume caffeinated beverages on a regular basis. Alcohol consumption is also common but not at a rate of about one - in - two adults for daily or near - daily consumption. Aspirin is a medication used for pain relief and is not consumed by half of the adult population on a regular basis in the sense of daily intake. Opiate medications are prescription drugs used for pain management and are not consumed by half of the adult population.

Answer:

caffeine.