Final answer:
The correct answer is b. Having worked outside for hours, the subordinate pool was refreshing.
Step-by-step explanation:
The correct answer is b. Having worked outside for hours, the subordinate pool was refreshing.
This option combines the two sentences in the most logical and grammatically correct way.
The phrase 'Having worked outside for hours' is a dependent clause that provides the context for the refreshing nature of the subordinate pool on a hot day.