Which sentence is written correctly?

Ms. Andrade showed us a documentary in class today because the film "Focuses on a similar subject" to a book we are going to read.

Ms. Andrade showed us a documentary in class today because the film, "focuses on a similar subject" to a book we are going to read.

Ms. Andrade showed us a documentary in class today because the film "focuses on a similar subject" to a book we are going to read.

Ms. Andrade showed us a documentary in class today because the film, "Focuses on a similar subject" to a book we are going to read.

The correct answer is C. Ms. Andrade showed us a documentary in class today because the film "focuses on a similar subject" to a book we are going to read.

Explanation:

In writing, quotation marks (") are commonly used to enclose the information that does not belong to the author of a text but was said and written by an external individual. As any other punctuation mark quotations follow strict rules that include using quotations at the beginning and end of the quotation, capitalize the first word in a quotation only if this belongs to a proper noun or it is the beginning of a sentence and avoid using commas, semicolon or similar after or before the quotation especially the quotation is part of a sentence in the text.

This implies the sentence that is written correctly is Ms. Andrade showed us a documentary in class today because the film "focuses on a similar subject" to a book we are going to read because in this sentence the first word is not capitalized as "focused on a similar subject" is the middle of a sentence and also this sentence does not include unnecessary commas or punctuation that disrupt the complete sentence.

Ms. Andrade showed us a documentary in class today because the film, "Focuses on a similar subject" to a book we are going to read.