Answer:
D
Explanation:
Turning Waste into Energy is like unwanted produce because its a waste and energy is a nutritious source of food for the farm animals.
Prepositions indicate direction, time, location, and spatial relationships, as well as other abstract types of relationships.
Prepositions indicate relationships between other words in a sentence.
Many prepositions tell you where something is or when something happened.
As the name suggests they generally tell position if something. Like, behind, front, on, at etc.
