BF: an insurer got a bad business result for a auto policy because so many thefts. The insurer have no way to deal with the theft, so ( decide to give discount to the auto owner whose car equipped with anti-theft device) Therefor, many auto go to buy anti-theft device. (because anti-theft device is useful for ) so the insurer will get a good business.
A.The former is a position the author wants to defend and the later is an evidence to support the position.
B.The former is a position the author wants to challenge and the later is its ev idence to oppose to it
第一句话是Strategy,第二句话是Assumption还是Evidence