Three flavors of juice are offered at a school cafeteria. The table shows the number of students who purchased each flavor during three lunch periods. 
 Based on the table, what is the probability that a student who bought juice chosen at random purchased the grape flavor?
 Orange-51
 Grape- 30 
 Cherry-69
 A. 0.2
 B. 0.25
 C. 0.3
 D. 0.33