[A]: Vestigeal organs are those parts of the body which are greatly reduced and are use- less.
[R]: These are the remnants of once fully de- veloped organs which are gradually lost as these were no longer necessary

Options

A. 1)If both A and R are true and R is the correct explanation of A
B. 2)If both A and R are true but R is not the correct explanation of A
C. 3)If A is true and R is false
D. 4)If both A and R are false

Answer

A