Whose book is that?

The correct answer is It's Mita's because it uses proper possessive form. Here's a breakdown of why this option is correct:

    
• It's is a contraction of "it is," which correctly indicates that the item belongs to Mita.
    
• Mita's shows possession, meaning the book belongs to Mita.

Let's look at why the other options are incorrect:

    
• a. It's of Mita's. - This phrasing is awkward and not commonly used in English.
    
• b. It's Mitas'. - This uses an incorrect possessive form; it should have an apostrophe before the 's' in Mita's.
    
• d. Its Mita's. - "Its" is a possessive pronoun for things, not people, and incorrectly implies possession.

Therefore, It's Mita's is the clearest and grammatically correct option.

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