Scientists developed an antibiotic to fight harmful bacteria that cause
infections. After several years of use, the antibiotic became less effective.
Which of the following caused the antibiotic to become less effective?
A Bacteria that were resistant to the antibiotic survived to produce more
resistant bacteria.
B Bacteria that were not resistant to the antibiotic began to produce
resistant bacteria through meiosis.
C Bacteria that were not resistant to the antibiotic learned how to protect
themselves from the antibiotic.
D Bacteria that were resistant to the antibiotic lost their resistance with
repeated exposure to the antibiotic.