Consider the conversion of X to Z through the sole intermediate Y. Given the reaction-energy diagram shown below, which step is the rate-limiting step? Explain your reasoning. 
Definitions:
Conjunction
In grammar, a word used to connect clauses or sentences or to coordinate words in the same clause.
Symbolize
The act of representing something using symbols or symbolism.
Neither
A conjunction used to indicate that two or more specified alternatives are not the case.
Antecedent
The first part of a conditional statement, the "if" clause, indicating the condition in a hypothetical proposition.
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