Which of the following (with specific heat capacity provided) would show the smallest temperature change upon gaining 200.0 j of heat?

Specific heat capacity is is the amount of heat energy required to raise the temperature of a unit mass by 1 kelvin.  
Heat is given by mass × specific heat capacity× change in temperature
Hence change in temp = mc/H
In A  temperature change will be (50 × 0.903)/ 200 = 0.22575 °C
In B temperature change will be (50 × 0.385)/200 = 0.09625 °C, 
Therefore; 50.0 g Cu , Ccu = 0.385 J/gC, will show the smallest change in temperature.

Carbon based or cells?