Since when does curiosity begin to lessen in intensity and extent but improve in quality

A．Many artists lost faith in the value of art.
B．Many artists moved away from large cities.
C．Many artists were forced to take jobs in other fields.
D．Many artists in the United States moved to other countries.

A．The animals over-fertilize the soil.
B．Dead plant roots can’t hold the soil together.
C．The wrong types of plants are left standing.
D．There is a buildup of plant and animal matter.