Support networks for artists include

These are the options for the question:

-Galleries

- Critics

- Materials suppliers

- Museums

And this is the correct

All of them

Explanation:

All the options listed in the question are support networks for artists.

Galleries support artists by displaying their works, and allowing them to close sales.

Critics support artists simply by giving publicity to their work. Even a negative opinion by a critic can work in the favor of an artist's work.

Material suppliers provide the inputs that artists use to create their works.

Finally, museums serve a similar function to galleries, but on a larger scale.