Answer: D) Choosing a video game is hard there are so many for sale.
Explanation: a fused sentence is a type of sentence in which two independent clauses are run together without an appropriate conjunction or mark of punctuation between them, such as a semicolon or a period. From the given options, the one that is an example of a fused sentence is the corresponding to option D, where we have two independent clauses joined without any punctuation between them: "Choosing a video game is hard" and "there are so many for sale."