Refer to the Figure

Refer to the figure.
These pie charts show American attitudes toward same-sex encounters. Which of the following is a reasonable conclusion, based on the information shown?

A) Gay rights efforts have backfired, leading to increased homophobia since 1990.
B) Americans have become more sharply divided in their attitudes over the last two decades.
C) Americans have become significantly more accepting of same-sex encounters since 1990.
D) Attitudes toward same-sex encounters have not significantly changed over time.
E) People have become more black and white in their thinking on this issue.