[求助]请教一道逻辑题

Which of the following most logically completes the passages?

Concerned about financial well-being of its elderly citizens, the government of Runagiadecided two years ago to increase by 20 percent the government-provided pensionpaid to all Runagians over 65. Inflation in the intervening period has been negligible, and the increase has been duly received by all eligible Runagians. Nevertheless, many of them are no better off financially than they were before the increase, in large part because_______.

A. They rely entirely on the government pension for their income.

B. Runagian banks are so inefficient that it can take up to three weeks to cash a pension check

C. They buy goods whose price tend to rise especially fast in times of inflation

D. The pension was increased when the number of elderly Runagians below the poverty lever reached an all-time high

E. In Runagia children typically supplement the income of elderly parents, but only by enough to provide them with a comfortable living.

B,C答案已经排除
            请教解题思路，
            为何选E呢？

个人认为，E的意思是，维持家庭收入主要（typically)依靠孩子们的收入。老年人的收入增长20%,并不会让全家生活水平大幅提高，高于comfortable的标准。

我个人是采用排除法选择E。

好像用数学的方法可以想通 谢谢啦

什么数学方法？说说