Consider the set M = {-1028, -2050/5, -3/25, 0, 4/21, 1, √24, 11, 9π}. Identify which of its elements are irrational numbers.

• A. -2050/5, -3/25, 4/21
• B. 0, 1, 11
• C. -1028, 0, 1, 11
• D. √24, 9π

Answer: (D)