the only correct sentence from those you've provided is "their's is the one on the right, under the box" because it's the only sentence using the possesive form correctly.
first sentence -> it's = it is ; its is the possesive
third sentecne -> his' does not exist
fourth sentence -> no possesive form is used at all.
The correct sentence that uses possessive personal pronouns correctly is option D: 'Have you seen the cat and its kittens?' The other options contain errors in their use of possessive forms. Option D correctly employs 'its' to show ownership without an apostrophe, which is the correct form for a possessive pronoun.
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