Figure 1 shows the reaction profile for the combustion of methane:
methane+oxygen→carbon dioxide+water\text{methane} + \text{oxygen} \rightarrow \text{carbon dioxide} + \text{water}methane+oxygen→carbon dioxide+water
Based on Figure 1:
a.[1]
Identify which letter represents the activation energy of the reaction.
b.[1]
Identify which letter represents the potential energy level of the products.
c.[1]
State the type of chemical reaction shown, given that thermal energy is released to the surroundings.