Identify Which Revision Correctly Repairs the Dangling/misplaced Modifier Error in the Following

Identify which revision correctly repairs the dangling/misplaced modifier error in the following sentence:
The cowboy sat on a fence smoking a cigarette.

A) While smoking a cigarette, the cowboy sat on a fence.
B) The cowboy sat on a fence that was smoking a cigarette.
C) Both A and B are correct.
D) Neither A nor B is correct.