A Woman Telephones the Clinic to Say That It Has

A woman telephones the clinic to say that it has been 6 weeks since her last menstrual period,but a home pregnancy test run today was negative.She asks,"Do you think I could be pregnant?" After determining that the test was performed correctly,the nurse's best reply would be:

A) "Probably not.These tests rarely give a false-negative result."
B) "You might be.If you haven't started your period in one week,you should repeat the test following the instructions carefully,and call the clinic again."
C) "You probably are.There are a lot of false-negative results with these tests."
D) "You might have an ectopic pregnancy.You should be seen by a doctor in the next few days."