Question

Which sentence contains a dangling modifier?

Answer 1

Answer:

Option A, After walking to school, the bus slowly passed by.

Explanation:

When the sentence itself is not clear about what is being modified, then the modifier is termed as dangling modifier

Sometime these dangling modifier refer to a word with in a sentence that does not even appear in it.

Here the phrase "After walking to" does not make any sense as a modifier . it is not directly modifying the work school but it intends to modify it.  

Option A is correct

Answer 2

The sentence that contains a dangling modifier is A. After walking to school, the bus slowly passed by.
As you can see, the modifier after walking to school is dangling because it refers to a word that is not present in the sentence.