The Great Circles

Q. Read the following statements about great circles and select the option that is true.

Assertion [A]: Great circles are highly useful for navigation.

Reason [R]: They represent the longest distance between two points on a sphere.

1. Both A and R are true. R provides the correct explanation for A.
2. Both A and R are true. R provides the incorrect explanation for A.
3. A is true but R is false.
4. Both A and R are false.

Q. Which among the following is a great circle?

1. Tropic of Cancer
2. Tropic of Capricorn
3. Equator
4. Arctic Circle