D is the correct answer.
Step-by-step explanation:
D. Glenda chooses to check 300 monitors.
A binomial experiment is defined as a statistical experiment which consists of n repeated trials. Only two possible outcomes are possible in each trial- either its a success or a failure. Here the probability of success remains the same on every trial.
Now, to know about the defects through binomial experiment Glenda must choose a number of computers or trials. So, option D is correct.