A College Dining Hall Has Available Two Fruit Juices for Breakfast

Multiple Choice

A college dining hall has available two fruit juices for breakfast: orange and grapefruit.One hundred students drink juice on a daily basis.It is found that a student will not drink grapefruit juice on two successive days,and if a student drinks orange juice one day,then the following day the student is equally likely to drink orange juice as to drink grapefruit juice.If 40 of the regular juice drinkers drink orange juice on Monday,how many can be expected to drink orange juice on Wednesday?

A) 10
B) 30
C) 50
D) 60
E) 90