Concept:This sentence requires the singular possessive form of the name “Andrew” to show ownership.
Explanation:The given sentence is: “This is not your book, it is ______.”
The blank must refer to “Andrew’s book,” because the idea of possession is already introduced by “your book.”
For a singular proper noun like Andrew, the possessive is formed by adding an apostrophe and “s”: Andrew’s.
Option A, “Andrew,” is just the name and shows no possession.
Option B, “Andrews,” is the plural form or a surname, not possessive.
Option D, “Andrews’,” is the plural possessive form, which would be used if the owners were multiple people named Andrews.
Therefore, only option C correctly completes the sentence.
Answer:C. Andrew’s