I'm not sure why this question was wrong can you explain which one the correct answer is and why it is the correct one?

Question 3 0 out of 10 points Which of the following describes the moment arm of the biceps? Selected Answer: The moment arm of the biceps becomes shorter as the elbow is flexed past 90 degrees Answers: The moment arm of the biceps becomes longer as the elbow is flexed past 90 degrees The moment arm of the biceps becomes shorter as the elbow is flexed past 90 degrees The moment arm of the biceps is at its longest when the elbow is flexed 90 degrees The moment arm of the biceps does not change based on the elbow flexion angle