How was bill cosby or oprah winfrey contributed to shaping a better world

Bill Cosby has always pushed for the promotion of education as a means of uplifting people’s lives and has stressed the importance of family and taking responsibility in shaping the hearts and minds of people.  Oprah Winfrey has promoted various programs that are aimed conserving energy and protecting the environment.

answer; /// i believe that the correct answer is (c)

answer; i had to look this up and the only one i found was(last only 15 minutes) plz check first and good luck;