What is the best choice for why an HR professional would choose external recruiting sources?

A.) Because it is the less expensive option.

B.) Because it is the usual way of recruiting applicants.

C.) Because it is the faster option.

D.) Because there are no qualified internal candidates.

D.) Because there are no qualified internal candidates.

This is the best choice because external recruiting sources are typically used when there are no suitable candidates within the organization. If there are no qualified internal candidates available, HR professionals may choose to look externally to find the right fit for the position.