Amin is working on a new design project and has created three mock-ups.

At what stage would Amin show the mock-ups to the client?

presentation

Explanation:

Based on the information provided within the question it can be said that Amin would show the mock-ups to the client during the presentation stage. This is the stage in which a speech or talk is done in front of the client's as well as showing them the new product, idea, or work. Therefore the three mock-ups that Amin created would be shown the the client's during this stage.