The correct answer is option 3: Strait of Dover. The Strait of Dover is located between France and the United Kingdom, specifically between the English Channel and the North Sea. It is a narrow stretch of water that separates the two countries and connects the Atlantic Ocean to the English Channel. The strait is approximately 33.8 kilometers wide at its narrowest point and is one of the busiest shipping lanes in the world. It is an important route for maritime trade and transportation between Europe and the United Kingdom. The other options provided are not located between France and the United Kingdom. Cook Strait is located in New Zealand, Davis Strait is located between Greenland and Canada, and the Strait of Gibraltar is located between Spain and Morocco.