We know, Thermal capacity $=$ mass $\times$ specific heat capacity $\therefore$ Specific heat capacity $= \frac{\text{Thermal capacity}}{\text{mass}}$ $\because$ Thermal capacities of A and B are same. $\therefore$ Specific heat capacity $\propto \frac{1}{\text{mass}}$ $\because$ Mass of B is less than mass of A. $\because$ So, Specific heat capacity of $B$ will be more.