If Z = ATP formed via substrate level phosphorylation in the diagram below, which of the following compounds (represented by an uppercase letter) contains a high-energy bond? 
Definitions:
Sexual Orientation
An individual's pattern of emotional, romantic, or sexual attraction to others, based on the gender(s) to which one is attracted.
Business Partner
An individual or organization that collaborates with another to run a business or project, sharing in the risks and rewards.
Entity
Any individual, company, organization, or structured group with a distinct legal existence.
Shares
Financial instruments that represent ownership in a company or corporation, entitling the holder to a portion of its assets and profits.
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