<span>B- Conquerors brought Roman ideas and engineering to England.
</span><span>The statement that best explains the existence of structures such as Roman baths and aqueducts in England is that conquerors brought Roman ideas and engineering to England. Roman uses to build baths and aqueducts in order to convey water to the city and they had developed a technique that, for some aspect, still continues today. </span>
Marginal costs. Keep in mind that marginal means on the edge of something, so the cost of producing one more unit would be on the edge. Hope this explanation helps.
