Two Hundred People Were Asked If They Had Read a Book

Multiple Choice

Two hundred people were asked if they had read a book in the last month.The accompanying contingency table,cross-classified by age,is produced. Given that a respondent read a book in the last month,the probability that he or she is at least 30 years old is the closest to ________.

A) 0.33.
B) 0.46.
C) 0.65.
D) 0.88.