【单选题】

Every morning a client with type 1 diabetes receives 15 units of Humulin 70/30. What does this type of insulin contain

A、70 units of NPH insulin and 30 units of regular insulin.
B、70 units of regular insulin and 30 units of NPH insulin.
C、70% NPH insulin and 30% regular insulin.
D、70% regular insulin and 30% NPH insulin.