—How about coming to see me in the office tomorrow afternoon?

—________，but I have to meet a guest at the airport.

A．All right　　　　 　

B．Sounds great

C．No problem　　　　 　

D．No，I am very sorry

下列计算正确的是 [ ]

A．（﹣p²q）³=﹣p⁵q³

B．（12a²b³c）÷（6ab²）=2ab

C．3m²÷（3m﹣1）=m﹣3m²

D．（x²﹣4x）x^﹣1=x﹣4