In a Routine Examination, Some Blood Is Taken and Analyzed

Multiple Choice

In a routine examination, some blood is taken and analyzed. The results show a high IgM titer for the mumps virus but a low IgG anti-mumps titer. This would indicate the person

A) has just recovered from mumps.
B) was recently infected with mumps.
C) is allergic to mumps.
D) is immune to mumps.
E) is relying on passive immunity.