B. Lower tail area of 0.05 with 50 degrees of freedom C. Upper tail area of 0.01 with 30 degrees of freedom. D. Where 90% of the area falls between two t values with 20 degrees of freedom. I. Lower t value. II. Upper t value. E. Where 95% of the area falls between two t values with 39 degrees of freedom. I. Lower t value. II. Upper t value