Why Did the Majority of the Court of Appeal in Nettleship

Why did the majority of the Court of Appeal in Nettleship v Weston allow the driving instructor's claim? Please select all that apply.

A) To prevent the injustice that might follow should the standard of care be varied according to someone's knowledge of another's skill
B) To punished the defendant for failing to pay attention
C) To ensure that the claimant could be adequately compensated by the defendant's motor insurance
D) To avoid the confusion that may follow if the standard of care varied according to the claimant's experience or expertise