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A. A → 3, B → 1, C → 2, D → 4
B. A →5, B → 1, C → 2, D →6
C. A → 4, B → 1, C → 2, D → 3
D. A → 6, B → 1, C → 2, D → 3

C. A → 4, B → 1, C → 2, D → 3

CSS Property	Function
A. background-color	1. Sets an image as the background of an element
B. background-image	2. Specifies how a background image repeats
C. background-repeat	3. Defines the position of a background image within an element
D. background-position	4. Sets the background color of an element
	5. Specifies whether the background is fixed or scrolls with the page
	6. Controls the transparency of the background color