<span>I am assured that option ‘’D. Jenny and Sam’s wedding was joyful.’’ of course is the right one, because according to the basic grammar rules, when we have an example where the main object ( the wedding) belongs to several pronouns (Jenny and Sam), we need to put possessive "s" ONLY after the last pronoun (in that case after the second).<span> </span></span>
D) Jenny and Sam's wedding was joyful is the correct way to use apostrophes to show joint ownership. Using it this way makes the readers understand that "their" wedding was joyful. The other options use grammar incorrectly and make the sentence less clear to the reader. The apostrophe must be placed before the S on the last persons name to correctly show joint ownership in this sentence.
