Ayla uses a one-sample t test to test if American football players have higher testosterone levels than men in general, whose average level is 542 ng/dl. The mean testosterone levels of the football players was 863 ng/dl and the sample standard deviation was 214 ng/dl. What is the effect size in this study? A) -1.5 B) -1.2 C) 1.2 OR D) 1.5