The correct answer is D) fun, exciting, and cool
A product aimed at an audience of teenagers would show that the product is fun, exciting, and cool.
Teenagers like cool new things that can be so attractive to their likes. They do not like boring things or boring activities. Companies need to market their products aimed at teenagers in a way that can be modern, attractive and if is possible, with a technology application. That is what they like. If the product is not exciting, they do not use them. So yes, it is correct y¿to say that a product aimed at an audience of teenagers would show that the product is un, exciting, and cool.
The other options of the question were a) sturdy, reliable, and safe, b) tested and well built, and c) traditional, tested, and conservative.