The right answers is option c
What do you mean? like the entire book??
A. Density increases
The density of planet earth is the lowest at the surface and increases the further you move to the middle.
Answer:
Mrs. Grayson, the much loved teacher of first grade, retired last year.
Explanation:
The subject of this sentence is Mrs. Grayson, and the sentence says she retired last year at age seventy two. "The much loved teacher" describes Mrs. Grayson, and should have a comma after (and before it).