Read the following context and choose the best option to answer the question.
Context: So last night I took my final exam in " Public Opinion and American Politics " . It 's the shortest class I ' ve ever taken . It was during the first summer term , a six week class meeting for three hours , two times a week ( Tuesday and Thursday ) . So in total we had twelve class meetings .
Question: What may be the reason that they took the summer class ?
Options: 
- They had previously failed the class .
 - They wanted to graduate in the summer .
 - They needed it to graduate in the fall semester .
 - They needed the class credits .


They needed the class credits .