Question

how did botticelli make the paint he used?
he mixed ground pigment and egg yolk for paint with a sheen.
he ground minerals into milk and honey to create paint that adheres to canvas.
he made watercolors to apply on freshly spread plaster.
he mixed powered pigment with oil for a lustrous effect.

Explanation:

Botticelli used tempera paint. Tempera is made by mixing ground pigment with a binder. Egg yolk is a common binder in tempera. This mixture gives the paint a sheen. The other options are incorrect. Milk and honey are not typical binders for his paint. Watercolors on plaster is more related to fresco (but not in the way described here). Oil - based paints (with the description of "powered pigment with oil") became more prominent later than Botticelli's time (Botticelli was a Renaissance painter, and oil painting techniques were further developed later).

Answer:

He mixed ground pigment and egg yolk for paint with a sheen.