Use the Following to Answer Questions

Multiple Choice

Use the following to answer questions :
In a hypothesis test with hypotheses and ,a random sample of 20 elements selected from the population produced a mean of 67.8 and a standard deviation of 11.9.The significance level is 5%.Assume the population is normally distributed.
-What is the critical value of t?

A) -1.645
B) -1.725
C) -1.729
D) -2.093