Appositive is defined as a noun, a noun phrase, or a noun clause which sits next to another noun to rename it or to describe it in another way. The sentence can still be completed without an appositive but adding it can present more information about the subject.
Answer:
C. The author describes the details and logistics of the clean-cookstove effort before he states his support.
The woman lays still, blood pooling around her body as people crowd around her. She's cold to the touch, skin growing more pale as each second passes.
Give more context please?