初二水平一道英语选择题.

初二水平一道英语选择题.
Which program was on CCTV-8 last night?
There was ______cartoon Pleasant Goat and Big Big Wolf at 6:30.
A.a B.an C.the D./
你们的答案到底行不行啊？一下子说A、一下子又C、一下子又D。。告诉我详细理由。