Answer the following questions using the data given below:
 
a. A and R correct, R explains the A.
b. A is correct, R is wrong.
c. A is wrong, R is correct.
d. A and R are correct, R doesn't explains A.
  
Assertion (A) The Relative Molecular Mass of chlorine is \(35.5\) \(amu\).
Reason (R) The natural abundance of chlorine isotopes are not equal.