When a cheese is streaked with blue marks like this, we say it is

When a cheese is streaked with blue marks like this, we say it is blue cheese.

Explanation:

The blue cheese (also called as mold cheese) is made by growing cultures of a fungi (penicillium) in process of cheese making. The fungi (penicillium) is used in various food types & drugs.This penicillium causes blue veins to grow in the cheese after the curds are processed into cheese. Due to this fungi, the blue cheese tastes very salty. It can be eaten directly or spread over a toast.Examples: Aura cheese, is a very popular Finland cheese produced by a finnish dairy company "Valio".

You answer would be c.