Final answer:
Option 4, "Gravity is a dent in the fabric of space and time," is an example of a scientific theory.
Step-by-step explanation:
Of the options provided, option 4, "Gravity is a dent in the fabric of space and time," is an example of a scientific theory. A scientific theory is a well-established explanation that is supported by evidence and tested by multiple people. In this case, the theory of gravity explains how matter interacts with other matter in space and time.