Question

1. bucolic is to urban as (a)dense is to spare (b)rural is to ephemeral (c)elastic is to plastic (d)mist is to smog (e)rustic is to toxic

Explanation:

"Bucolic" refers to rural or countryside - related, and "urban" refers to city - related, they are opposites. "Dense" and "spare" are also opposites where "dense" means crowded or thick and "spare" means sparse or not abundant.

Answer:

A. dense is to spare