Read the following context and choose the best option to answer the question.
Context: Ten minutes after we left the station the bus broke down . My roommate had told me that would probably happen . A 45 minute delay followed before another bus showed up to transfer us . The new bus was in worse shape and made terrible grinding noises like the gears were shot every time the driver shifted .
Question: Why did the bus break down ?
Options: 
A. The bus had caught a flat tire .
B. The bus had ran out of gasoline .
C. It was having issues with the engine .
D. None of the above choices .


C