Assertion A : The load factor for live load is greater than that for dead load. Reason R : The live loads are more uncertain than dead loads?

Select your answer based on the coding system given below :
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. A is false but R is true.