<p>Societies acting through their governments make the rules to state which acts are illegal, but although war is the most violent of human activities, it has not been declared illegal by any of the worlds governments or their agencies.</p>
<p>(A) to state
(B) stating
(C) when they state
(D) that are stating
(E) where they state
ANSWERS AND EXPLANATIONS </p>
<p>Explanation for Correct Answer B : </p>
<p>Choice (B) is correct. It avoids the error of the original by using an idiomatic verb form, the present participle stating, to modify the noun rules.</p>
<p>eh? what's "idiomatic verb form?"
If a verb is followed after rules, does it always have to be in a present participle form?</p>
<p>“Societies acting through their governments make the rules to state which acts are illegal, but although war is the most violent of human activities, it has not been declared illegal by any of the worlds governments or their agencies.”</p>
<p>The sentence wants to say that the rules state which acts are illegal, not that the societies do. “To state” modifies “societies” (incorrect) while “stating” modifies “rules” (correct).</p>
<p>Idiomatic verb form doesn’t refer to a specific phrase you should know. “Idiomatic” just means that it pertains to a distinctive way of saying things</p>