Assertion (A): Saturated hydrocarbons are chemically less reactive. Reason (R): All the valencies of carbon atoms are satisfied by single covalent bonds.
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.