The correct option is C Bacteria : Candida
Candida are fungi that grows as yeast which cause candidiasis in human, a fungal infection typically on the skin or mucous membranes.
One of the alternate sources of proteins for animal and human nutrition is Single Cell Protein (SCP). Microbes are being grown on an industrial scale as source of good protein. They include species of blue green algae (Spirulina), Fungi (Fusarium), Bacteria (Methylophilus), etc.