Assertion (A): According to Mendeleeff, periodic properties of elements is a function of their atomic masses.
Assertion (R): Atomic number is equal to number of protons A)Both (A) and (R) are true and (R) is the correct explanation of (A) B)Both (A) and (R) are true and (R) is not the correct explanation of (A) C)(A) is true but (R) is false D)(A) is false but (R) is true

Options

A. Both (A) and (R) are true and (R) is the correct explanation of (A)
B. Both (A) and (R) are true and (R) is not the correct explanation of (A)
C. (A) is true but (R) is false
D. (A) is false but (R) is true