3. An individual __ the course of antibiotic treatment even after they notice an improvement in symptoms in order not to develop resistance to it. A) needs to complete B)must have completed C)had to complete D) may have completed E) may complete

The correct answer is A) needs to complete. It is important for an individual to complete the course of antibiotic treatment even after they notice an improvement in symptoms in order to prevent the development of antibiotic resistance. Completing the full course ensures that all the bacteria are eliminated and reduces the risk of the remaining bacteria becoming resistant to the antibiotic.