Barry Drank Quite a Lot at the Biggest Party of the Year

Multiple Choice

Barry drank quite a lot at the biggest party of the year. Later, he had trouble falling asleep, so he took a barbiturate. If he dies from respiratory failure during the night, it is probably because the alcohol and barbiturate had:

A) a synergistic effect.
B) antagonistic actions.
C) complementary actions.
D) a cross-tolerance effect.