HELP MEEE PLEASE

A has the highest concentration

Explanation:

I'll simply explain it this way;

get a color pour the whole color in a solution in container A then add a little drop in the another container(B).

you'll find out that the first container has a thicker color than container B the same thing goes for this, Beaker A has a thick looking color unlike the rest.

answer; talc and gypsum;