Which sentence has a misplaced modifier?

a. on her way home, emma found a dollar.
b. trey didn't hear the phone ringing in his pocket.
c. bree saw a deer driving down the street.
d. walking to school, mike dropped his watch.

The sentence that has a misplaced modifier is option D. Walking to school, Mike dropped his watch. A misplaced modifier consists of a group of words that does not clearly state the exact word it modifies because the words are misplaced or left out thus, calling it a dangling modifier.