Which three dimensional figure matches this net

B is the right answer.

The net makes a cube, since all of the faces are squares and there are 6 of them.
If you don't believe me, you can always make the net on paper, cut it out, and see what figure you get.

Hope this helps!

Asmall closed hole formed in an outwash plain or moraine. forms when a  glacier retreats then remains stationary.