Which sentence states a fact?
A: The prettiest parts of the Rocky Mountains are in the state of Wyoming.
B: In the United States, the Rocky Mountains stretch from New Mexico to Montana.
The second sentence states a fact.
In the United States, the Rocky Mountains stretch from New Mexico to Montana.
It can be proved by checking a map of the United States.
The first sentence states an opinion.
The prettiest parts of the Rocky Mountains are in the state of Wyoming.
Prettiest shows what a person believes, thinks, or feels. Another person might have a different opinion about where the prettiest parts of the Rocky Mountains are.