A random sample of 423 Chinese Americans has completed an average of 12.7 years of formal education with a standard deviation of 1.7. The national average is 12.2 years. Do Chinese Americans tend to complete more years of formal education than the nation as a whole? Of the tests of statistical significance you have learned in this course, the one that would be most appropriate for answering this question is the one-sample t test. The computed or obtained t for this test is

A) 6.024.

B) -6.024.

C) 0.500.

C) -0.500.

D) 1.960.