Early mass communication theories

Early mass communication theories suggested that audiences were passive recipients of media messages and thus vulnerable to manipulation. Which of the following best describes current thinking?
a. Audiences are more vulnerable and passive than ever before.
b. Television viewing, in particular, increases activity in the brain's right hemisphere.
c. Active receivers are not uniformly affected by mass communication messages.
d. Technology has led to increasingly passive recipients at the ends of the message transmission systems.