Question

Which sentence contains a misplaced modifier? A. The trail up the mountain winds alongside a rushing stream. B. During the climb, Mr. Swanson slipped on a loose rock up a steep hill. C. By late afternoon, they arrived in a meadow and set up camp. D. The Swansons sat on a rock beside the stream and had a snack.

Answer 1

Sentence A is the answer. That is because it doesn't sound like the sentence is the way it should be put together. 

Answer 2

B. " Up a steep hill" should be added after during the climb before the coma. So the sentence would be like: During the climb up a steep hill, Mr. Swanson slipped on a rock.
Hope this helps.