Chem.......?

A is definitely correct, for any endothermic reaction, the equilibrium shifts to the products. Regarding alternative C, if this is done in a closed vessel, the pressure will definitely increase. Pressure is directly proportional to temperature at constant volume. Since it is favoring the products and there are 3 gaseous molecules, one more than the reactant side, in a closed container, the pressure will increase. In an open container, then C will not be correct, since you are allowing the gases to escape against constant pressure, atmospheric pressure, therefore volume is increasing as temperature is increasing, making the pressure irrelevant, since the increase in volume decreases pressure, while the increase in temperature increases pressure, so they cancel each other out.