Which of the following most logically completes the passage?

Concerned about financial well-being of its elderly citizens, the government of Runagia decided two years ago to increase by 20 percent the government-provided pension paid 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 ________.

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

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

3. They buy goods whose prices tend to rise especially fast in times of inflation

4. The pension was increased when the number of elderly Runagians below the poverty level reached an all-time high
5. In Runagia children typically supplement the income of elderly parents, but only by enough to provide them with a comfortable living

结论是many of them are no better off financially than they were before the increase

要找原因解释为什么在考虑了通货膨胀因素后，许多老人在实际已经拿到比以前更多的退休金的情况下，经济状况反而不如以前了呢？当然一个可能的原因是，老人的经济状况不仅决定于他的退休金，可能还有子女给的钱什么的。

而E正式说明了这一点(In Runagia children typically supplement the income of elderly parents, but only by enough to provide them with a comfortable living).

所以，应该是E.