Read the following context and choose the best option to answer the question.
Context: Wow ... I ' m so fucking immature . But tonight was a fucking funny class . I was in Geology , and we were covering Igneous rocks ( lava rocks , basically ) . We were talking about how different types of rocks melt at different points , and how the higher melting points work and all that .
Question: What may be the reason why class was so funny ?
Options: 
A. They were laughing at themselves .
B. They were laughing at their classmates .
C. None of the above choices .
D. They kept joking about the rocks .


D