Read the following context and choose the best option to answer the question.
Context: The cashier was looking at him ... also waiting . She looked at me , looked back at him , and then back at me . What passed unsaid between us was " what 's this guy 's problem ? " .
Question: Why are the cashier and customer exchanging looks ?
Options: 
A. The customer is empathising with the cashier
B. The customer is bored with the cashier
C. The customer is flirting with the cashier
D. The customer is angry with the cashier


A