During the Donor Screening Process,the Potential Donor's Blood Drop Sinks

During the donor screening process,the potential donor's blood drop sinks to the bottom of the copper sulfate solution within 15 seconds.What is the interpretation of this test?

A) The hemoglobin is within limits;however,the hematocrit must be checked.
B) The donor has an acceptable hemoglobin and hematocrit to donate.
C) The donor is temporarily deferred.
D) The specific gravity of the copper sulfate is incorrect.