Which statement about the ACT English test is accurate?
[APEX LEARNING: COLLEGE AND CAREER PREPARATION II]
A: The test asks students to to write a five-paragraph essay on a topic of their choice.
B: The test consists of open-ended questions that ask students about punctuation and grammar.
C: The test assesses students' understanding of usage, style, and sentence structure.
D: The test is considered the most difficult section on the ACT and is therefore optional.