Read the sentence. noah who draws comic books in his free time wants to write a graphic novel. which version of the sentence has correctly placed commas?

noah, who draws comic books in his free time, wants to write a graphic novel.
noah, who draws comic books, in his free time wants to write a graphic novel.
noah who, draws comic books in his free time, wants to write a graphic novel.
noah who draws comic books, in his free time, wants to write a graphic novel.

The answer to your question would be that the version of the sentence that has correctly placed commas is the following one: Noah, who draws comic books in his free time, wants to write a graphic novel.  That is, your answer would be option A.

The clause set off with the commas is a non-restrictive relative clause. This means that it provides information which is considered non-essential to the meaning of the sentence and therefore can be dropped without altering its meaning. That is why they are set off with commas, parentheses or dashes.

  plan: i will begin with a quotation about the importance of unity in a community. then, i will state my claim that an activity will unite our school by creating a shared vision, purpose, and direction. in the body, i will use three main points that describe the different avenues the students can take: through a variety of clubs, through a special event, or through an awareness week. i will provide evidence about other towns that have unity activities and the kinds of events that they include. pictures will illustrate my three main points in action. for the ending, i will restate the main idea in a new way and pose a question to keep the audience thinking. 

type of error:

the error in the sentence is a "dangling modifier". a dangling modifier is a phrase, word or clause that "dangles" because there is not target to modify. in this case, "after mopping the floor" is the dangling modifier since it has no word to modify. the noun "house" cannot mop the floor; therefore there is a mistake in the writing of the sentence.