Assertion (A): Pent-1-ene and Pent-2-ene are position isomers. Reason (R): Position isomers differ in the position of the functional group or a substituent.

a) Both A and R are true, and R is the correct explanation of A.

b) Both A and R are true, but R is not the correct explanation of A.

c) A is true, but R is false.

d) Both A and R are false.