Read the following context and choose the best option to answer the question.
Context: After we finished work on the deck we drove around different places selling watermelons out of the back of Norm 's truck . We got about 150 for $ 100 and sold them 1 for $ 3 or 2 for $ 5 . We figured it 'd be an evening of easy money . Only we only sold about 20 so we did n't even make back our investment .
Question: Why is the person selling watermelons ?
Options: 
A. They are looking to make it their main business .
B. It is their primary income .
C. They are trying to make extra money .
D. None of the above choices .


C