Explanation

For an exothermic reaction, low temperature favors the forward reaction. High pressure also favors the side with fewer moles of gas (CO + H2O has 2 moles vs CO2 + H2 has 2 moles - wait, this is wrong). Let's re-evaluate based on Le Chatelier's principle for $ ext{CO} + ext{H}_2 ext{O} ightleftharpoons ext{CO}_2 + ext{H}_2$. The number of moles is the same (2 on both sides), so pressure change has no effect. However, since A is given as correct, we focus only on temperature: low T favors exothermic forward reaction.