The table below shows the results of a survey in which 100 people were asked how often they watched the news. group a consisted of people who were registered voters, and group b consisted of people who were not registered to vote. if one person is randomly chosen from among those who watch the news fewer then three times a week, what is the probability that the person was a member of group a?

a. 21/38

b. 4/50

c. 21/50

d. 38/100