You Are Given Four Test Tubes,each Containing an Unknown Protist

Multiple Choice

You are given four test tubes,each containing an unknown protist.Your task is to read the following description and match these four protists to the correct test tube.
When red and blue light are shone on the tubes,oxygen bubbles accumulate on the inside of test tubes 1 and 2.Chemical analysis of test tube 1 indicates the presence of a chemical that is toxic to fish and humans.Chemical analysis of test tube 2 indicates the presence of substantial amounts of silica.Microscopic analysis of organisms in test tube 3 reveals the presence of an apicoplast in each.Microscopic analysis of the contents in test tube 4 reveals thousands of cilia on the surface of the organism.Please use the following information to answer the questions below.
-Test tube 2 contains

A) Paramecium.
B) Navicula (diatom) .
C) Pfiesteria (dinoflagellate) .
D) Plasmodium.