Which revision corrects the dangling modifier in this sentence?
walking down the street, the rain suddenly started.
the rain, walking down the street, suddenly started. walking down the street, the rain started suddenly.
the rain suddenly started walking down the street. as i was walking down the street, the rain suddenly started.

The sentence that corrects the dangling modifier is:

"As I was walking down the street, the rain suddenly started."

This sentence avoids the ambiguity since it is clear that it is not the rain that is  "walking" but "I".

The rest of the options are examples of dangling modifiers since they do not include the target that is being modified. This generates confusion in the reader.