A large store has a customer service department where customers can go to ask for help with store-related issues. According to store records, approximately $\dfrac{1}{4}$~of all customers who go to the service department ask for help finding an item. Assume the reason each customer goes to the service department is independent from customer to customer. Based on the approximation, what is the probability that at least I of the next 4 customers who go to the service department will ask for help finding an item? 
选项为:A:$4(\dfrac{1}{4})$  B:$1-(\dfrac{1}{4})^{4}$  C:$1-(\dfrac{3}{4})^{4}$  D:$4(\dfrac{1}{4})^{1}(\dfrac{3}{4})^{3}$  E:$(\dfrac{4}{4})(\dfrac{3}{4})(\dfrac{2}{4})(\dfrac{1}{4})$  请回答其中一个选项.