endothermic reaction

Coal can be used to generate hydrogen gas (a potential fuel) by the following endothermic reaction.
C(s) + H2O(g) < __> CO(g) +H2(g)
If this reaction mixture is at equilibrium, predict the effect (shift right, shift left, or no effect) of
a. adding more C to the reaction mixture.
b. adding more H20(g) to the reaction mixture.
c. raising the temperature of the reaction mixture.
d. increasing the volume of the reaction mixture.
e. adding a catalyst to the reaction mixture.