Understanding the argument -
During the past year, Pro-Tect Insurance Company's total payout on car-theft claims has been larger than the company can afford to sustain. - Problem
Pro-Tect cannot reduce the number of car-theft policies it carries, so it cannot protect itself against continued large payouts that way. - Also explaining the problem of choosing a normal solution, which is to reduce the number of car theft policies it carries and opening doors for choosing an alternate solution (providing discounts)
Therefore, Pro-Tect has decided to offer a discount to holders of car-theft policies whose cars have antitheft devices. - Pre-Tect's alternative solution or response to the problem. It is important to note that this is not the main conclusion as it says "has decided." This is something that was decided in the past, and the effect still continues, as shown by the present perfect.
Many policyholders will respond to the discount by installing such devices, since the amount of the discount will within two years typically more than cover the cost of installation. Response to the alternative solution.
Thus, because cars with antitheft devices are rarely stolen, Pro-Tect's plan is likely to reduce its annual payouts. - The main conclusion is that the plan is likely to reduce the annual cost. "is likely" explains the futuristic aspect of the steps we have taken.
Option Elimination -
(A) The first rules out a certain strategy for achieving a goal (OK, it rules out a strategy for reducing the car theft policies); the second presents the strategy that was adopted instead and whose effectiveness the argument assesses. (Ok. It presents an alternative strategy and furthers the argument, assesses why it'll be successful, followed by the main conclusion)
(B) The first is a judgment made in support of a certain conclusion (It is a fact and not a judgment); the second is that conclusion (BF2 is not a main conclusion)
(C) The first has been used as a consideration to support adopting a certain strategy for achieving a goal; (No. The first is a fact that rules out a certain strategy, which is reducing the car theft policies. It is in no way supporting the "certain strategy.") the second report a decision to adopt an alternative strategy (It's not a decision, but it presents a strategy. The word "decision" is a distortion. Yes, it has been used in the argument, and if you see the bigger picture, the statement just does not say that we have decided, period. It presents an alternative strategy, which is to offer discounts..... ).
(D) The first provides evidence in favor of adopting a certain strategy for achieving a goal (No, it rules out the "certain strategy," which is reducing the number of car theft policies); the second reports a decision to pursue an alternative goal. (No. The goal remains the same, which is to reduce the annual cost. It just presents an alternative strategy to pursue the same goal.)
(E) The first is a consideration offered against adopting a certain strategy for achieving a goal (ok); the second is the main conclusion that the argument is seeking to establish. (the BF2 is not the main conclusion).