Read the sentences. The inventor initially struggled to solve the problem. She discovered an ingenious solution. Which revision uses a coordinating conjunction to combine the sentences? The inventor initially struggled to solve the problem until she discovered an ingenious solution. The inventor initially struggled to solve the problem; however, she discovered an ingenious solution. The inventor initially struggled to solve the problem, but she discovered an ingenious solution. The inventor initially struggled to solve the problem before she discovered an ingenious solution.

The correct answer is C. The inventor initially struggled to solve the problem, but she discovered an ingenious solution.

Explanation:

Words such as but, or, and or yet are known as "coordinating conjunctions", these differ from other conjunction such as before, because or although because one function of coordinating conjunctions is to link two complete sentences. Moreover, in the English language, there are mainly seven conjunctions of this type and in general, these are placed between sentences and usually after a comma that introduces the conjunction.

This occurs only in the option "The inventor initially struggled to solve the problem, but she discovered an ingenious solution" because "but" is one of the most common coordinating conjunctions and this links two complete sentences "The inventor initially struggled to solve the problem" and "she discovered an ingenious solution."

From the complete excerpt, the revision that uses a coordinating conjunction is C. The inventor initially struggled to solve the problem, but she discovered an ingenious solution.

A coordinating conjunction simply means a word that is used to join two elements that are of equal grammatical rank and importance.

Based on the information given, the revision that uses a coordinating conjunction is that the inventor initially struggled to solve the problem, but she discovered an ingenious solution.

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