hich of these things is a protist?

A
Mycoplasma pneumoniae, a single-celled bacterium without a nucleus that causes pneumonia

B
Euglena spirogyra, a single-celled algae with a nucleus and flagella, or flippers, that help it move around

C
Geotrichum candidum, a complex, multicellular fungus used to make cheese.

D
Apodemus sylvaticus, a complex, multicellular creature known as a wood mouse.

B) Euglena spirogyra, a single-celled algae with a nucleus and flagella, or flippers, that help it move around is a protist.