Assertion (A) : An iron ball floats on mercury but gets immersed in water. Reason (R) : The specific gravity of iron is more than that of mercury.

(a)

Both A and R are individually true and R is the correct explanation of A

(b)

Both A and R are individually true but R is not a correct explanation of A

(c)

A is true but R is false

(d)

A is false but R is true