A study done 15 years ago found that only 12% of adult South Africans had rudimentary literary skills. You believe that this proportion has increased. You randomly select 245 adults from around South Africa and find that 37 of them have rudimentary literary skills. Using this information, you do a hypothesis test using a 5% level of significance. Which of the following pairs of hypotheses do you use for your test?

A. H_0∶ π=0.15 vs H_a∶ π>0.15
B. H_0∶ π=0.12 vs H_a∶π >0.12
C. H_0∶π =0.12 vs H_a∶π ≠0.12
D. H_0∶π =0.12 vs H_a∶π <0.12
E. H_0∶ π =0.12 vs H_ a∶ π =0.15