Based on the description given, Jack is in the nonrejecter stage of the marketing funnel.
The marketing funnel is used to describe the transition of customers towards becoming loyal to a brand. I’it keeps track of a customer's journey from getting to know a brand up till subsequent patronage of the brand.
The nonrejecter stage, marks the early stage of the marketing funnel, majorly after the first few purchases are made.
As for Jack, due to his disappointment which GreenFood's services and desire to try another brand. The fact that his first purchase was better at VeggiesNmore makes him contented and satisfied.
Therefore, Jack is in the Nonrejecter stage of the marketing funnel.
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