单项选择题

If you’re at minimum wage, and the employer says, "$ 4.65 an hour," an "OK" will freeze it right there. But a "Hmmm" response could increase it, and just 50 cents an hour more will earn you $1,000 extra in a year of 40-hour weeks.
The same goes for all other levels, too. A simple "Hmmm" instead of "OK" can change a$ 25,000 salary into $ 28,000 and finance your new computer system. $ 45,000 can be pushed to $ 30,000, affording you that much-needed two-week vacation.
Anybody can negotiate a better salary. An extra $ 0.50, $1, or even a $ 3--5 an hour increase seldom exceeds a company’s phone bill! From your perspective it’s a ten-to fifty-percent raise. From their perspective, an extra fifty cents an hour costs them only as much as an extra hour of long-distance calls a week -- something most businesses do without a second thought.
Don’t worry that the employer will change his or her mind about hiring you just because you ask for more. Going through the whole recruiting-interviewing-hiring process again will cost a company much more than $1,000--5,000 anyway in the long run. Odds(可能性) are, you’ll get that little extra, and the employer will still consider it a good bargain to avoid that hassle(麻烦).

Why can you get that little extra money successfully()

A.Because the boss likes you.
B.Because it costs much more to hire another employer.
C.Because you are an excellent employer.
D.The passage doesn't mention it.