Sentence1: My professor assigned my class an essay. Sentence2: By the time I left the classroom, I had forgotten about it. Sentence3: A few days later, my classmate messaged me to ask if I had done it. Sentence4: I was so upset because I had totally forgotten! 
 (A) I was worried about my grade. (B) I was sure I would get an A if I didn't turn in my essay.
A