While interviews are considered to be one of the most useful tools (3) for evaluating potential employees they also demand significant resources from the employer and have been demonstrated to be notoriously unreliable in identifying the optimal person for the job.
Read the passage underlined (3). There may be a mistake in punctuation, capitalization, or spelling. If you find a mistake, choose the answer that corrects the mistake. If there is no mistake, choose ‘Correct as is.’

A) Correct as is.
B) for evaluating potential employees, they also demand significant resources
C) for evaluating potential employees they also demand, significant resources
D) for evaluating, potential employees, they also demand significant resources