I will give 25 points(thats all of mine)

Plants take in carbon dioxide to do photosynthesis and gives off oxygen, the sheep in the field breathes in the oxygen the plants made.  When the sheep dies, it would put carbon into the soil by decomposition.  The powerplant will use the fossil fuel in the soil to create power, and ends up putting carbon in the air again.  The stages repeats again and again.

Explanation:

the correct answer is option d.

an appositive is a noun, noun phrase or noun clause which follows another noun or noun phrase in order to describe it or name it another way. they are usually used between commas, brackets or dashes.

the example sentence with the correct use of commas is the following:

her uncle, the man over there in the red shirt, owns the hardware store in town.