An insurance actuary tracks the customer mass and the dosage of a certain medicine prescribed to customers. An approximate least-squares regression line was used to predict the dosage, in milligrams, from a given customer mass in kilograms.

A. This customer was prescribed a dosage 50 mg higher than predicted based on the customer's mass.
B. This customer was prescribed a dosage 50 mg lower than predicted based on the customer's mass.
C. This customer has a mass 50 kg greater than predicted by the prescribed dosage .
D. This customers has a mass 50 kg lower than predicted by the prescribed dosage.