9. Water gas is a poisonous, flammable gas mixture comprising carbon monoxide (CO) and hydrogen (H2). It can be produced by blowing water vapor over red-hot coal: Which of the following statements is correct? (A) The reaction is spontaneous below a certain temperature (B) The reaction is spontaneous above a certain temperature (C) The reaction is always spontaneous (D) The reaction is always non-spontaneous (E) The reaction is always at equilibrium