What Does "Narrow Spectrum Antimicrobial" Mean

Multiple Choice

What does "narrow spectrum antimicrobial" mean?

A) The antimicrobial is effective for a very short time.
B) The antimicrobial is effective against a few microbes.
C) The antimicrobial can only be administered to a small segment of the population.
D) The antimicrobial is activated by a specific wavelength in the visible spectrum.
E) The antimicrobial is effective on all bacteria but not eukaryotes.