The setting sun was reflected on the river, _______     everything along the banks_______all the more beautiful.

A．to make; look

B．making; looking

C．making; look

D．making; to look

观察下列等式：

①cos2α=2cos²α-1；

②cos4α=8cos⁴α-8cos²α+1；

③cos6α=32cos⁶α-48cos⁴α+18cos²α-1；

④cos8α=128cos⁸α-256cos⁶α+160cos⁴α-32cos²α+1；

⑤cos10α=mcos¹⁰α-1280cos⁸α+1120cos⁶α+ncos⁴α+pcos²α-1；

可以推测，m-n+p=______．