It depends on your nature. I think every person have its own technique he/she uses when in tension.
But i saw that most people use the technique to drink alcohol to reduce or release their tension. some people liked to sit alone to reduce tension, some liked to listen music, some went on long drive, so everyone used different techniques. When i have to release tension, i will watch movie.
Answer: D.) Low Self-Esteem
Explanation:
Cynthia's back story does not provide any evidence to support that she has too many friends or that she is in too many activities. It explains that she does well in all of her other classes besides Biology, so it is safe to say her lack of confidence is not caused by low intelligence.
So finally, with all of the above in mind, I am lead to the answer being Low Self-esteem. She does not think she is smart enough to pass her course because she is not confident in herself.
Confidence is key!