Paulinella Chromatophora Is a Cercozoan That Secretes a Test, or Case

Multiple Choice

Paulinella chromatophora is a cercozoan that secretes a test, or case around itself consisting of plates made of silica. Which of the following is a rhizarian that would be in competition with P. chromatophora for the silica needed to make these plates, assuming limited quantities of silica in the environment?

A) radiolarians
B) foraminiferans
C) dinoflagellates
D) diatoms