The two primary settings of nectar in a sieve are
a.a rural village and a riverbank
b.a large city and a temple
c.a rural village and a city

Nectar in a Sieve is a novel by Indian author, Kamala Markandaya set between a rural village and a city which chronicles the marriage and life of Rukmani and Nathan amidst the differences, difficulties and desperations   of the country and city lives. The correct answer is C.

What a model shows is  a practical solution for some research by showing systems that have different sizes. Models are simplified representations of real objects/systems . you can make it easier  by zooming on a large system. You can also do something else to make it easier.