Below are the results of the students in an exam. Find the mode of given results.

• A. 90, 80, 77, 86, 90, 91, 77, 25, 45, 35, 66, 69, 65, 43, 65, 75, 43, 90, 89.
• B. 43
• C. 77
• D. 65
• E. 90