The "Chunnel," a tunnel under the English Channel, is the culmination of many years of _____________ cooperation between England and France. A. bilateral B. bipartisan C. bisected D. unilateral
so A. means having or relating to two sides; affecting both sides. B. means of or involving the agreement or cooperation of two political parties that usually oppose each other's policies. C. means divide into two parts. and D. Means (of an action or decision) performed by or affecting only one person, group, or country involved in a particular situation, without the agreement of another or the others.
Next Time google it
Bilateral also means "involving two parties, usually countries." :)
So that, by itself, would tell you which answer to choose. And I agree with her^
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