Which compound noun correctly indicates joint possession? clark's and powers's clarks and powers clark and powers' clarks and powers'

When indicating joint posession, all of the nouns involved are acting as one unit. When such a case occurs, the proper way of showing posession in the nouns is by writing the nouns and then adding 's to the last noun. Therefore, the answer will be Clark and Power's.

The answer would be Clark and Powers'

hope this help :)

Because the candy is bad somethi