An antimicrobial disk on a kirby-bauer plate that shows no zone of inhibition indicates that the microbe being tested is to the drug.
a. intermediate
b. synergistic
c. resistant
d. susceptible

The right option is; c. resistant

An antimicrobial disk on a Kirby-Bauer plate that shows no zone of inhibition indicates that the microbe being tested is resistant to the drug.

Kirby-Bauer test is a test that uses antimicrobial disks or wafers to determine whether specific bacteria are susceptible or resistant to specific antibiotics. The zone of inhibition which is an empty area on the Kirby-Bauer plate that surrounds an antibiotic disk shows whether the antibiotic worked against the specific organism. The larger the zone of inhibition, the more effective the antibiotics is but if the plate indicates no zone of inhibition, the tested organism is resistant or is not susceptible to that antibiotic (drug). This means that the organism will not respond to that particular drug regardless of the dosage and the area of the infection.

you didn't give any options but heres what i can tell you: an inference is likely to change based on additional observations. the latter is something that you have seen or sensed using your sensory organs while the former is like a conclusion out from what you have observed.