An ASO Test Was Performed on the Serum from a 10-Year-Old

An ASO test was performed on the serum from a 10-year-old female patient with the following results: no hemolysis in the 1:10,1:20,1:40,and 1:80 tubes; and hemolysis in the 1:160,1:320,and 1:640 tubes.What conclusion can you draw from these results?

A) The titer is 1:640,and the patient may have glomerulonephritis.
B) The titer is 1:160,and the patient may have rheumatic fever.
C) The titer is 1:80,and the patient is normal.
D) The test is invalid and must be repeated.