单选题：根据以下资料，回答题。　　An employer has several choices he can consider

根据以下资料，回答题。 　　An employer has several choices he can consider when he wants to hire a new employee．First, he may look within his own company．But if none of the present employees are suitable for the position, he will have to look outside the company．If his company has a personnel office, he can ask them to help find qualified applicants.
　　There are other valuable sources the employer can use, such as employment agencies, professional societies and so on．He can also advertise in the newspapers and magazines and ask prospective candidates to send in resumes.
　　The employer has two kinds of qualifications to consider when he wants to choose from among applicants．He must consider both professional qualifications and personal characteristics．A candidate's professional qualifications include his education, experience and skills．These can be listed on a resume．Personal characteristics must be evaluated through interviews. This passage mainly tells us __. A． there are many applications looking for a job
B． how an employer hires his employees
C． employer hires a new employee within his company
D． employer can advertise in newspapers and magazines