Which of the following, if true, best competes the argument below?

Comparisons of the average standards of living of the citizens of two countries should reflect the citizens' comparative access to goods and services. Reliable figures in a country's own currency for the average income of its citizens are easily obtained. But it is difficult to get an accurate comparison of average standards of living from these figures, because____________.

(A) there are usually no figures comparing how much of two different currencies must be spent in order to purchase a given quantity of goods and services.

(D) comparative access to goods and services is only one of several factors relevant in determining quality of life.

Answer: A

为何不是D??

原文的GAP在currency和access to goods and services之间。

举个例子：收入高，但是物价也很高，所以同样的钱不一定能买到一样的东西。

和D的access to goods and services 是不是唯一决定因素无关。