请选择DCBA5~.@.l1z/i --_______ did you have for breakfast yesterday?;H-x1Q-O9x6[)Q
A. When;H-x1Q-O9x6[)Q
B. Where;H-x1Q-O9x6[)Q
C. Who;H-x1Q-O9x6[)Q
D. What;H-x1Q-O9x6[)Q