What percentage of people in the U.S., age 12 and older, have tried MDMA at least once?

What percentage of people in the U.S., age 12 and older, have tried MDMA at least once?

a. 2%
b. 4%
c. 6%
d. 8%

Correct answer is option C. 6%. Explanation: 6% of people in the U.S., age 12 and older, have tried MDMA at least once.