Final answer:
Whidbey Island is located in Puget Sound, which is a network of marine waterways in the state of Washington.
Step-by-step explanation:
The sound in Washington that is home to Whidbey Island is A) Puget Sound. Puget Sound is a complex estuarine system of interconnected marine waterways and basins, with one of the largest islands within it being Whidbey Island. Whidbey Island is well-known for its scenic vistas, outdoor activities, and military installations, such as Naval Air Station Whidbey Island.