Answer: it has a happy ending, often involving in a marriage.
Explanation:
The option that defines a Shakespearean play as a comedy is that it has a happy ending, often involving in a marriage. It should be noted that being a comedy doesn't mean that the storyline should be funny.
Shakespeare's Comedies involve characteristics such as young lovers being faced with challenges, separation of the lovers and later reunification, mistaken identities, etc.
The answer is D: The language explains exactly what is so attractive and available for sale in Nebraska :)