Which of the Following Is an Example of a Brand

Which of the following is an example of a brand extension? 

A)  The manufacturers of Cocoa Flakes, a popular cereal, launches a cookie called "Cocoa Crunch" in a new product category. 
B)  Tracker, a company selling security systems, advertises its product on a local television network. 
C)  Dog Handler, a manufacturer of leashes for dogs, collaborates with a competitor to expand its market base. 
D)  Blossoms, a women's perfume line, advertises its new line through sales promotions and point-of-purchaseadvertising at department stores.