Final answer:
C. Wright Mills was the sociologist who suggested the connection between history and biography to explain the sociological imagination.
Step-by-step explanation:
The sociologist responsible for suggesting the connection between history and biography to explain the sociological imagination was C. Wright Mills. Mills introduced the concept of sociological imagination in his book The Sociological Imagination, where he emphasized the importance of understanding the intersection between personal experiences and the broader social and historical context. He believed that individuals should analyze their own lives in relation to larger social forces in order to develop a deeper understanding of society.