The correct answer is option 2), i.e. Where is Rita coming from? Explanation:
Option 1) is incorrect. The exclamation mark is used to express strong feelings like sorrow, wonder, surprise etc or to emphasize. Example: I have found the lost photo album!
Option 2) is the correctly punctuated sentence.
Option 3) is incorrect. The semicolon is used to join two complete sentences or independent clauses. Example: Your mother looks worried; she has checked your report card.
Option 4) is incorrect. The full stop is used at the end of a sentence. Example: She is my sister.