Experimenters Wanted to Know the Effects of Smiling or Frowning

Multiple Choice

Experimenters wanted to know the effects of smiling or frowning on the experience of emotion. To avoid problems with demand characteristics, the researchers had the participants in the experiment rate the funniness of cartoons while

A) viewing themselves in a distorted mirror.
B) holding a pen in their mouths, as a disabled person might.
C) their faces were numbed with a local anesthetic.
D) listening to a masking noise through a set of headphones.