What flavor does the pump labeled "M" dispense?

The pump labeled "M" dispenses mocha sauce, which is a common flavoring used in coffee beverages to provide a rich chocolatey taste. Mocha sauce is often utilized in lattes and other espresso drinks to create classic combinations like a mocha latte, which blends the flavors of coffee, chocolate, and steamed milk. This flavor is quite popular among customers who enjoy a sweeter, more indulgent coffee experience.

In contrast, the other options relate to different flavors that cater to various seasonal or distinct taste preferences. Pumpkin spice is typically associated with fall beverages, peach serves as a fruity flavor used in iced drinks, and raw sugar is a sweetener rather than a flavoring ingredient on its own. Therefore, mocha sauce stands out as the specific flavor associated with the pump labeled "M."