In the Following Two Reactions, the Test Tube Is Washed

In the following two reactions, the test tube is washed and centrifuged and only the reaction on the beads stays in the tube. The reaction on the right

A) includes the addition of the patient antigen and results in increased color
B) includes the patient antigen and results in decreased color
C) is a heterogeneous assay
D) makes this a capture assay