After math class, Heidi looked for a classmate to walk with, but the other students rushed out too quickly. She found the lesson on algebra confusing and wanted to talk about it with a classmate. Now, Heidi is worried she won't be able to complete her homework. What problem is Heidi most likely experiencing?

A. She has too much homework.
B. She does not understand algebra.
C. She does not have any friends.
D. She needs to move faster to keep up