Pair of words that have prefixes that mean not: irresponsible, illegal; because IR and IL are negative prefixes. Other negative prefixes are IN – IM – IG – NON – UN, etc. Prefixes are morphemes (the smallest grammatical unit) added at the beginning of a word to change its meaning. There are different kinds of prefixes with multiple usages.
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The correct answer is B) "These children are facing threats similar to the forceful conscription of child soldiers by warlords in Sudan or during the civil war in Bosnia. Being forced to sell drugs by narcos is no different from being forced into military service."
The author is bringing up a somewhat similar abuse of children which has already been thoroughly documented and the targeted audience likely have prior knowledge on.
The answer is A because the American people believe they will be victorious even though there is no promise that they will win.