Question

What is algin?

A. Diatomaceous earth used as an insulating material
B. Brown algae
C. A substance produced by brown algae used to thicken foods.
D. Diatom shells

Answer 1

Any hydrophilic, colloidal substance found in or obtained from various kelps, as alginic acid or one of its soluble salts.

Tell me if you don't understand what I put down and this is the definitions.

I think its D

Answer 2

C. A substance produced by brown algae used to thicken foods