Promotion could have multiple meanings.
For example, if you say "Mr. Knight got promoted (or got a promotion) from supervisor to manager". There promotion means "raise".
If a product is at promotion there promotion means advertising efforts.
It could also refer to a way to support a cause. For example: There's a campaing supporting healthy lifestyle promotion.
C because making the places where the crops would grow was dusty and every time wind would come through it would swoop the dust up in the air because of the groves
I believe the answer is "change to meet the needs of a modern society".
