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 atomic mass of aluminium is \(27\).
Reason (R)
An atom of aluminium is \(27\) times heavier than \(1/12th\) of the mass of the \(C–12\) atom.