[求助]L27-4-2

2.                 Twenty professional income-tax advisors were given identical records from which to prepare an income-tax return. The advisors were not aware that they were dealing with fictitious records compiles by a financial magazine. No two of the completed tax returns agreed with each other, and only one was technically correct.

If the information above is correct, which one of the following conclusion can be properly drawn on the basis of it?

(A) Only one out of every twenty income-tax returns prepared by any given professional income-tax advisor will be correct.

(B) The fact that a tax return has been prepared by a professional income-tax advisor provides no guarantee that the tax return has been correctly prepared.

(C) In order to ensure that tax returns are correct, it is necessary to hire professional income-tax advisor to prepare them.

(D) All professional income-tax advisors make mistakes on at least some of the tax returns they prepare.（B）

(E) People are more likely to have an incorrectly prepared tax return if they prepare their own tax returns than if they hire a professional income-tax advisor.

Answer is B; Why A is not right?

No two of the completed tax returns agreed with each other, and only one was technically correct. 任何两个都不相同，只有一个是对的；说明这个对的和其它19个都不相同，Why A is not right?