Final answer:
Reach in advertising is the number of different people or households exposed to an advertisement, indicating the breadth of audience that gets to see the ad.
Step-by-step explanation:
Reach in advertising refers to C) the number of different people or households exposed to an advertisement. It is a measure of the scope or extent of an advertising campaign's audience. With the vast number of television viewers and the 250 billion hours of television watched annually in the United States, ads on platforms like Nick Jr. and Telemundo are tailored to meet a market demographic through comprehensive viewer data. This targeting is crucial for advertisers to effectively connect with potential consumers.