While looking for a campsite, a tornado touched down near the park.
Explanation:
A dangling modifier is a modifier that incorrectly or ambiguously modifies a word or phrase. Modifiers serve to add more information or context to the sentence.
The choices in the problem all have modifiers at the beginning of the sentence. Because of this, we expect that the word after the modifier should be the one that it's modifying.
We can notice that the modifier in the second choice seem to be telling us that the tornado was looking for a campsite. This is clearly illogical and not what the sentence is implying. This is therefore a dangling modifier.
