Topic: Fill in the Blank,

Best Answer Explained in Below-:

The correct answer is A) "committed," as it is the past tense form of the verb "commit," which is used to indicate that an action has already taken place. In the context of the sentence "The war criminals ... a crime," we are referring to actions taken by individuals that classify them as war criminals, which typically involves activities such as murder, torture, or other serious violations of international law.

Options B) "did" and C) "do" are not suitable in this context because they do not convey the necessary specificity regarding the action's timing. "Did" refers to past actions but lacks the explicit connection to the noun "crime" that "committed" provides. On the other hand, "do" implies ongoing or general actions, which does not align with the nature of war crimes that have already occurred.

Option D) "have" is also incorrect since it would require an additional verb phrase to be grammatically correct, such as "have committed." Therefore, "committed" accurately reflects the completed nature of the actions associated with war crimes, making it the appropriate choice.