Michelle was told to drink 2 1/2 cups of orange juice today. Michelle drank 7/8 of a cup in the morning, 3/8 of a cup at lunch, and 5/8 of a cup at dinner. How many cups of of orange juice did Michelle drink today?
A.1 1/2
B.1 5/8
C.1 7/8
D.2 1/2