题目内容：
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 posi- tion,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, profes- sional societies and so on. He can also advertise in the newspapers and magazines and ask prospec- tive 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.
根据以上内容,回答题.
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
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答案解析：