Each garnish should provide flavor, function, appropriate size, and which other element? A.
color
B.
height
C.
texture
D.
thickness

color

Explanation:

color adds to presentation, flavor adds to the overall taste of the dish, and function and size add to the interpretation of the dish.

height is too similar to size to be a new category, texture goes along with function, aka the reasoning behind the garnish, and thickness is too similar to size as well. color is the correct answer.