Find the Critical Value $n$ Denotes the Number of Pairs of Data

Multiple Choice

Find the critical value. Assume that the test is two -tailed and that $n$ denotes the number of pairs of data. $n = 20 , \alpha = 0.01$

A) $= 0.570$
B) $0.570$
C) $\pm 0.447$
D) $\pm 0.570$