QUESTION 9 A psychoactive drug is aan) mental functioning.
a. medication prescribed by a physician that affects
b. chemical substance used to increase
c substance that alters
d. illegal substance that affects

b.chemical substance used to increase

Explanation:

A chemical substance that changes nervous system function and results in alterations in perception, mood, consciousness, cognition, or behavior.

obama was told in early july 2004 that he was chosen to deliver the address, and he largely wrote the speech himself, with later edits from the kerry presidential campaign.

i would say a because the main idea is what the author is the point the author is trying to get across.