Mutant Fruit Flies That Make Only One Antimicrobial Peptide Were

Mutant fruit flies that make only one antimicrobial peptide were tested for survival after infection with Neurospora crassa fungi or with Micrococcus luteus bacteria.

The results shown in the graphs support the hypothesis that ________.

A) adding the defensin gene to such mutants protects them from death by bacterial infection
B) adding the drosomycin gene to such mutants protects them from death by bacterial infection
C) wild-type flies with the full set of genes for antimicrobial peptides are highly susceptible to both fungal and bacterial pathogens
D) the presence of any single antimicrobial peptide protects against both fungal and bacterial pathogens