请教一道PP听力题

M: It’s such a beautiful day.  To bad I got to work in a computer lab afternoon.

W: At least my botany lab meeting’s in the greenhouse.  I guess it could be worse.

What does the woman imply?

   She prefers being in the greenhouse to the

      computer lab.

   She doesn't like her botany class.

   She works part time in the computer lab.

   She needs to go to the lab after her class.  

为什么答案是a啊？

I guess it could be worse是什么意思啊？

哦，明白了，多谢二位