2. What is the correct definition of “triple point” ? (A) The temperature and pressure at which solid, liquid, and gas simultaneously exist. (B) The most common experimental conditions of 1 atm, 298 K, and 1 mole of material. (C) The reaction conditions of material at which the oxidated state and reduced state are equally likely to occur. (D) The series of cyclical conditions at which a material can change from solid to liquid, liquid to gas, or gas to liquid.