Which sentence requires the use of a citation?

a. driving down the road, you often see teenagers engaging in the dangerous practice of texting while driving.
b. in 2010, texting while driving was found to be the cause of 27% of traffic accidents among teen drivers.
c. i admit that i am guilty of texting while driving, but i have made an effort to put my phone away while driving.
d. teenagers should put their phones down and concentrate on driving instead of who is texting them.

B. In 2010, texting while driving was found to be the cause of 27% of traffic accidents among teen drivers.

Explanation:

Citation is usually a reference to a source. It becomes necessary when we borrow some words or ideas, data, from a source which may be a text, an article or any other written piece, which is required to mention and acknowledge the resource. Among the given options, the sentence that requires citation is option B, as it illustrates the data that requires substantial support and evidence to support the claim or else it would be considered either incorrect or unauthentic. Thus, the second option is the answer as it borrows the factual information from a database.