The correct answer is (B) sometimes
Is this statement always, sometimes, or never true?
If (m∠L) and (m∠M) sum to (90°), and (m∠L) is a (25°) angle, then (m∠M) would be (90° - 25° = 65°).
Now, you can evaluate cos(M) and sin(L):
cos(M) = cos(65°)
sin(L) = sin(25°)
Whether cos(M) is equal to sin(L) depends on the specific values of cos(65°) and sin(25°).
Therefore, they are not guaranteed to be equal, so the statement is sometimes true, depending on the values of the angles involved.