Read the excerpt from Roosevelt’s "Four Freedoms" speech.

A part of the sacrifice means the payment of more money in taxes. In my Budget Message I shall recommend that a greater portion of this great defense program be paid for from taxation than we are paying today. No person should try, or be allowed, to get rich out of this program; and the principle of tax payments in accordance with ability to pay should be constantly before our eyes to guide our legislation.

What purpose does the underlined portion of this excerpt serve in the argument that Americans should agree to pay more taxes to raise money for entering the war?

It introduces the claim that patriotic Americans should be willing to sacrifice and pay extra taxes.
It provides the reason why extra taxes must be collected should America decide to join the war.
It counters the claim that extra taxes may not be collected fairly or put to good and honest use.
It offers evidence that Americans can trust their president should extra taxes be collected.