Accepted Answer
We can choose "prior to" as the conjunction in the sentence, since the adverb "prior" is functioning like a subordinating conjunction here, as seen below.What is a conjunction?A conjunction is a word placed between sentences to show either a relationship of dependence or independence between them. When the relationship is of dependence, we have a subordinating conjunction, such as:WhileIfWhenBeforeAfterBecauseIn the sentence we are analyzing here, the expressions "prior to" is equivalent to "before". Alone, the word "prior" can be a noun or an adjective. Accompanied of "to", it becomes an adverb stating that something happened before something else.The two expressions, "prior to" and "before," can thus function as a subordinating conjunction, establishing a relationship of dependence between sentences. One sentence indicates what happened before the other sentence.For that reason, even though the expression "prior to" is not originally a conjunction, we can select it as our answer. In this particular situation, it functions as a subordinating conjunction.Learn more about conjunctions here:https://brainly.com/question/8094735#SPJ1