A Reliability Coefficient (R) and a Standard Error of Measurement

Multiple Choice

A reliability coefficient (r) and a standard error of measurement (SEM) were computed on a test with 10 items.What would happen to those statistics if the test were increased to forty items?

A) r would decrease, SEM would increase.
B) r would decrease, SEM would stay the same.
C) r would increase, SEM would decrease.
D) r would increase, SEM would stay the same.