I believe it would maybe be B or A , Hope this helps.
Computers are the excellent means for storage of patient related data.It is often necessary to maintain detailed records of the medical history of patients. Doctors often require the information about a patient's family history, physical ailments, already diagnosed diseases and prescribed medicines.
The result of MINUS operator will be 10 - 2 = 8 records (number of records in CUSTOMER - number of common records).
Over 200 mph generally now I says 300 mph