Verified Answer :

The two sentences are in opposition to each other, so you could say for example:

Designing shoes is hard work, but it will pay off in the end. (with or without the coma).

or:

Designing shoes is hard work; however, it will pay off in the end. (make sure to use this interpunction)

The answer is D. Designing shoes is hard work; however, it will pay off in the end.

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