The best and most correct answer among the choices provided by your question is the third choice or letter C.
The lesson that the parable of "The Prodigal Son" mainly conveys is that: "<span>Everything that was once lost will one day be found again."</span>
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Every gerund has the same form - verb + -ing. So, having that in mind, the word <em>sleeping </em>is used as a gerund in this sentence, but it is also a subject of the sentence.