There are 10 different food item in buffet. A customer is asked to get a certain number items. If the customer has 210 possible ways as a result, which of the following did he possibly do?
A. Choose out 4 of the 10 items
B. Choose out 5 of the 10 items
C. Choose out 7 of the 10 items
D. Choose out 8 of the 10 items