The apparent expansion of a liquid when heated in a copper vessel is C and when heated in a silver vessel is S . If A is coefficient of linear expansion of silver is

Question

$(a)\;\large\frac{C+S-3A}{3}\qquad(b)\;\large\frac{C+3A-S}{3}\qquad(c)\;\large\frac{C+3A+S}{3}\qquad(d)\;\large\frac{C+3S+A}{3}$