The correct answer is: A. metropolitan : urban
Pastoral refers to the countryside, while rural refers to the countryside as opposed to the city. Similarly, metropolitan refers to a large city, while urban refers to a city or town.
B. harvest : autumn is incorrect because harvest is the act of gathering crops, while autumn is the season of the year that follows summer.
C. agrarian : benevolent is incorrect because agrarian refers to agriculture, while benevolent refers to being kind and generous.
D. sleepy : nocturnal is incorrect because sleepy refers to being tired, while nocturnal refers to being active at night.
E. wild : agricultural is incorrect because wild refers to being untamed, while agricultural refers to farming.