Identify the sentence in the following passage that contains a dangling modifier.

We started the hike just before dawn. Having fifteen miles to cover in one day, we needed the early start. Hiking up the first ridge, the sun burst through the trees. The day was off to a promising start.

Multiple choice question.

Having fifteen miles to cover in one day, we needed the early start.

We started the hike just before dawn.

Hiking up the first ridge, the sun burst through the trees.

The day was off to a promising start.