The correct option is A Spirulina, Methylophilus, Chlorella, Saccharomyces
Edible microbes or technically Single Cell Proteins, in short SCP, make a good alternate source of proteins for animal and human nutrition. Microorganisms like algae, fungi, yeast and bacteria utilize inexpensive feedstock and wastes as sources of carbon and energy for growth to produce biomass, protein concentrate or amino acids. Spirulina maxima, Chlorella pyrenoidosa are algae that can be used to produce SCPs. Fungi like Saccharomyces cerevisiae and bacteria such as Methylophilus methylotrophus are also good sources of SCPs.