单项选择题

For job seekers
There is a new type of small advetisement becoming increasingly common in news- papers classified columns. It is sometimes placed among" situations vacant", although it does not offer anyone a job, and sometimes it appears among "situations wanted", al- though it is not placed by someone looking for a job either. What it does is to offer help in applying for a job.
"Contact us before writing your application," or "Make use of our long experience in preparing your resume or job history," is how it is usually expressed. The growth and apparent success of such a specialised service is, of course, a reflection on the current high levels of unemployment. It is also an indication of the growing importance of the resume (or job history), with the suggestion that it may now qualify as an art form in its own right.
There was a time when job seekers simply wrote letters of application. "Just put down your name, address, age and whether you have passed any exams," was about the average level of advice offered to young people applying for their first jobs when they left school. The letter was really just for openers, it was explained, everything else could and should be saved for the interview. And in those clays of full employment the technique worked. The letter proved that you could write and were available for work. Your eager face and intelligent replies did the rest.
Later, as you moved up the ladder, something slightly more sophisticated was called for. The advice then was to put something in the letter which would distinguish you from the rest. It might be the aggressive approach. "Your search is over. I am the person you are looking for," was a widely used trick that occasionally succeeded. Or it might be some special feature specially designed for the job in view.
There is no doubt, however, that it is the increasing number of applicants with university education at all points in the process of engaging staff that has led to the greater importance of the resume.
Now a demand for this type of service has been created because ______.