[clarity]

1.Your prompt action____a seriois accident.
Aattracted B avoided C fought D prevented
Key is D but i chooe B. Why B is not Ok?

2.The job is much easier than I____
A.guessing B.guessed C would have guessed D guess
remember one sentence is "than i expected" so i chooe B. But the key is C. i am puzzled. Why?

Thanks in advance