The correct answer is B. An unhappy ending.
Explanation
The tragedy is a type of literary text or dramatic theatrical expression that is characterized by having leading characters who face a fatal destiny that gives rise to a hopelessly sad end, which usually ends in the death of the characters. According to the above, Romeo and Juliet’s final fate in Act V, scene III of Romeo and Juliet represents the characteristic unhappy ending of Shakespeare's tragedy because in this scene both die tragically. So, the correct answer is B. An unhappy ending.