What are the three parts of a shot?

The three parts of a shot are crema, body, and heart, making this the correct answer.

Crema is the golden froth that forms on top of a freshly pulled espresso shot, created by the emulsification of oils and gases during the brewing process. It adds flavor and a visual appeal to the shot. The body refers to the thicker liquid espresso that contains the concentrated flavors and essential oils extracted from the coffee grounds. Finally, the heart characterizes the deep, rich liquid that constitutes the bulk of the espresso shot. Understanding these three parts helps in appreciating the complex flavors and textures that espresso offers, as each component contributes to the overall experience of the coffee.

Other options do not accurately represent the components of a shot of espresso, focusing instead on unrelated aspects or mischaracterizations of coffee preparation.