The reaction Ag-B(g) is spontaneous under standard conditions. Which of the following statements must be true? I. The reaction B(g)-A(g) is nonspontaneous under standard conditions. II. Ag will be completely converted to B(g) if sufficient time is allowed. III. Ag will be completely converted to B(g) rapidly. A) I and II B) I and III C) II and III D) none of these