Suppose that in the hypothetical country of trashland, garbage cans are distributed on a first-come, first-served basis. this distribution rule gives the residents of trashland an incentive to spend time.

maintaining their place in line

Explanation:

The first-come first-serve basis of distribution is mostly used when the government is providing free commodities to its citizens. This method shows that rationing by waiting is a great way to satisfy the demand of everyone. In this method, as described, the residents of Trashland enjoys an incentive of ensuring that they maintain their place in the queue or line in order to enjoy the commodity.

the correct labels are as follows:

a: yellow river

b: himalayan mountains

c: north china plain

d: taklimakan desert

it is the boston port act