Final answer:
The garnish for a Hand-Shaken Agave Mojito is traditionally a 2. mint sprig, providing both visual appeal and a complementary aroma.
Step-by-step explanation:
The traditional garnish for a Hand-Shaken Agave Mojito is a 2. mint sprig. This garnish adds to the visual appeal and provides an aromatic element that complements the flavors of the drink.
Mojitos often also include a lime wedge either in the drink or as an additional garnish on the rim of the glass, but the mint sprig is the most characteristic garnish that signifies a mojito.