A security guard at a certain store is instructed to check the receipt of one out of every five customers as they are leaving the store. If, on the guard's shift,
customers leave the store, how many different samples of customers could have been selected to have their receipts checked?
Choose the correct choice:  A) 20  B) 10  C) 59  D) 90  E) 100
to choose the sample of 2 customers from 5. it can be done 5C2 possible ways.   So the answer is B. 10
<result>B</result>
A security guard at a certain store is instructed to check the receipt of one out of every five customers as they are leaving the store. If, on the guard's shift,
customers leave the store, how many different samples of customers could have been selected to have their receipts checked?