Please not only answer but explain, especially the test statistics part of this problem

An increased number ot colleges have been using online resources to research applicants. According to a study from last year, 31% of admissions ofcers indicated that they visited an applying student's social networking page. A random sample of 500 admissions otcers was recently selected and it was found that 160 at them visit the social networking sites of students applying to their college. Using a = 0.01, complete parts a and b below. a. Does this sample provide support tor the hypothesis that the proportion of admissions ofcers who visit an applying students' social networking page has increased in the past year? Determine the null and alternative hypotheses. Choose the correct answer below. 0A. H0:p>0.31 os. Hozp=0.31 H1:pS0.31 H1:p$0.31 0c. HD:pS0.31 on. Hozp20.31 H1:p>0.31 H1zp