The diagram illustrates the reaction profile for a reversible reaction. Which of the following statements are correct? 1. The forward reaction is exothermic. 2. The enthalpy change for the forward reaction is $-30\ \text{kJ mol}^{-1}$. 3. The enthalpy change for the backward reaction is $+90\ \text{kJ mol}^{-1}$.
- A1, 2 and 3 are correct
- B1 and 2 only are correct
- C2 and 3 only are correct
- D1 only is correct