Answer:
d: Walking my dog in the park, a soccer ball flew our way.
Step-by-step explanation:
Dangling modifiers are words, phrases, or clauses that modify a word but are placed in such a way that it is difficult to know or understand which word is being modified. In other words, when modifier words are placed away from the words they modify and it changes the meaning of the sentence, then that modifier is a dangling modifier.
Among the given sentences, sentence d contains a dangling modifier. The modifier "walking my dog in the park" is placed in such a way that it seems it is modifying the soccer ball, which is not the case. This misplaced modifier makes the whole sentence sound awkward and almost impossible too.
Thus, the correct answer is option d.