(c) Nuclear density for all nuclei is same and equal to $10^{17}\ kgm^{- 3}$
Radius of nucleus and mass number are related as
$\ \ \ \ \ \ \ \ \ \ \ \ \ \ R = R_{0}(A)^{1/3}$
$or\ \ \ \ \ \ \ \ \ \ \ \ \ \ R \propto \ (A)^{1/3}$
Thus, (A) is true but (B) is false.