Hi, how would I go about answering this question?

Research has shown that individuals look at their mobile phone 150 times each day, on average (o= = 25). Suppose you randomly draw a sample of 64 mobile-phone users with the purpose of assessing the average number of times they look at their phone. What is the standard deviation of the corresponding sampling distribution? A. 6.000 O B. 25.000 C. 0.625 O D. 3.125