Answer : The correct option is, a valley between two peaks
Explanation :
Reaction intermediate : It is defined as the short lived compound that is formed in a chemical reaction between the reactant and the desired products. The intermediate compounds are unstable compounds.
In a reaction progress curve, a valley between two peaks on the curve corresponds to an intermediate of the reaction. That means a valley between the two peaks of the transition state.
As per question,
The point at the far left of the curve are the reactant.
The top of a peak is the transition state.
The point at the far right of the curve are the product.
Hence, the correct option is, a valley between two peaks
The energy diagram are shown below.