Check my answer ; )
a commercial depicts a teenager on a skateboard vandalizing a brick wall. this is an example of:

a. bias

b. vested interest

c. stereotype

d. manipulation of information

i think it is c

C. stereotype

Explanation:

A stereotype is  a widely known characteristic of a certain demographic, in this case it is that skateboarders are vandals, and that they commonly paint with graffiti on walls, another example of stereotypes is that all asians are good at math, the commercial is using an example of stereotype.

which speech are you talking about?