According to a university of wildlife ecology and conservation researcher, the average level of mercury uptake in wading birds in a region has increased over the pa several years. Five years ago, the average level was 15 parts per million. . . . . . a. Give the null and alternative hypotheses for testing whether the average level today is more than 15 ppm. O A. Ho: H = 15, Ha: H# 15 O B. Ho: H # 15, Hai H > 15 O C. Ho: H = 15, Hai H > 15 O D. Ho: H = 15, Hai H