Designing shoes is hard work; however, it will pay off, in the end, is the correct sentence that combines the passage into the compound sentence. Thus, option D is correct.
<h3>What is a compound sentence?</h3>
A compound sentence is a sentence that includes a single predicate and subject. The independent clauses of the sentence are joined together by coordinating conjunctions.
The last sentence correctly combines the sentence as it uses the coordinating conjunction, however before the comma, and is appropriate as it clearly explains the meaning of the passage.
Therefore, option D. the last sentence using the word, however, is the correct option.
Learn more about compound sentences here:
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