Which Description Best Explains the Difference Between Orientation and Migration

Which description best explains the difference between orientation and migration?

A) Orientation by birds can be achieved by using the sun or stars in order to determine the direction they should be flying. Navigation is the ability of the birds to change their direction in response to environmental clues.
B) Orientation is the ability of the birds to change their direction in response to environmental clues. Navigation by birds can be achieved by using the sun or stars in order to determine the direction they should be flying.
C) Orientation by birds can be achieved by using the sun or stars in order to determine the speed they should be flying. Navigation is the ability of the birds to change their direction in response to social clues.
D) Orientation by birds can be achieved by using the sun or stars in order to determine the direction they should be flying. Navigation is the ability of the birds to change their direction in response to predator and prey abundance.
E) Orientation by birds can be achieved by using the Earth's magnetic field in order to determine the direction they should be flying. Navigation is the ability of the birds to change their direction in response to environmental clues.