I was advised _____ for reservations. 85年考研选择题 求解答

I was advised _____ for reservations. 85年考研选择题 求解答
I was advised _____ for reservations.
A. to either telephone or to write the hotel
B. either to telephone or to write the hotel.
C. that I should telephone or write the hotel.
D. I ought either to telephone or write the hotel.


答案是B 选项 但是我觉得A选项比较合理 求解答