Answer:
Potted plants were placed near the patio doors, on the kitchen counter, and in the bathroom.
Step-by-step explanation:
Parallel structure is when a sentence is written using the same pattern and grammatical form. In other words, parallel structure or parallelism is when a sentence is written using the same grammatical structure or form in the same sentence.
The given cluster of sentences can be rewritten into a single sentence with parallel structure as below-
Potted plants were placed near the patio doors, on the kitchen counter, and in the bathroom.
Here, parallelism is used in "the patio doors, on the kitchen counter, and in the bathroom".