Which sentence uses a present participle as part of a verb (rather than as an adjective or noun)?

A) Marjorie always enjoys cooking with her mother.
B) Watching television is often a colossal waste of time.
C) All existing theories are currently wrong, in my opinion.
Eliminate
D) The children were roaming through the field without a care in the world.

The first sene: alice was performing a magic trick with a wand and a small spell book that her grandfather had given her. while she was practicing she saw matt who was one of the other contestants, while she was practicing matt bumped in to her and made her say the spell wrong. all of a sudden a swoosh of sparkling purple wind picked them up and put them back on the floor. when they looked at each other alice saw herself and that’s when she realized that they had switched bodies.