Answer:
The sentence with parallel structure is "We will rent a cabin, take our fishing poles, and sleep under the stars. "
Explanation:
Parallel structure imposes a series of activities that should be done of equal importance. The clauses and phrases should be identical to the activity that was said first. In the selected option, activities like “Rent a cabin”, “Take our Fishing poles” and “Sleep under the stars” is a perfect example that explains a parallel structure or parallelism. Having even one non serial phrase will not be considered as a parallel structure as we could see in the other options.