Read the paragraph about composting. Then answer the question that follows.

(1) Compost is made up of organic matter (leaves, grasses, fruits, vegetables, and manure) that has decayed. (2) Compost is often used as a soil fertilizer. (3) It improves the quality of the soil. (4) Today many people take part in composting in their own backyards. (5) This activity allows natural ingredients to be returned to the soil. (6) At-home composting improves the soil for plants and gardens. (7) Composting helps to reduce the amount of waste going into landfills. (8) Composting is very simple for people to do on their own. (9) It requires a designated area where compost materials can collect and decay. (10) In some cases, people use worms in order to assist in the decay process, especially when space for composting is a concern.

Which of these best combines sentences 2 and 3?

A. Compost is often used as a soil fertilizer; also, it improves the quality of the soil.
B. Compost is often used as a soil fertilizer, finally, it improves the quality of the soil.
C. Compost is often used as a soil fertilizer because it improves the quality of the soil.
D. Compost is often used as a soil fertilizer; however, it improves the quality of the soil.