Which of the Following Statements Is Correct According to Research

Which of the following statements is correct according to research on today's job applicant pool?

A) Applicants with connections to insiders do not work as hard on the job as those who applied without knowing anybody in the company.
B) It is harder to judge the quality of candidates who apply online than it is to judge those who apply in person.
C) Applicants who apply through online channels are better-quality candidates than those who apply in other ways.
D) Qualified applicants have become harder to find due to more specific job descriptions and technological advances.