Which step below is rate determining

What is the rate determining step in the following energy profile? To clarify, the reaction is:


A -> B -> C


The energy of A is greater than B which in turn is also greater than C. The intermediate A-B is higher energy that the B-C intermediate but the energy gap between B and the intermediate B-C is greater than from A to the A-B intermediate. I hope this is clear.


![Energy Profile](https://i.stack.imgur.com/gCmyM.png)




The second step is rate-determining. According to [Wikipedia](https://en.wikipedia.org/wiki/Rate-determining_step#Reaction_Coordinate_Diagram):



> 
> Given a reaction coordinate (energy diagram), the rate determining step can be determined by taking the largest energy difference between any starting material or intermediate on the diagram and any transition state that comes after it. That transition state will then be the rate-determining step of a given reaction. The transition state with highest absolute energy may not necessarily correspond to the rate determining step.
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The second step is the rate determining step in the case that this is not an equilibrium reaction; however, if B can go back to A(therefore it is an equilibrium rxn) then it is easier for B to proceed to C instead of going back to A, right? The graph can go in both ways and then the first step will be the determining. It has the highest point of energy needed to be overcame. 


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