Astatement that one particular race is smarter or more athletic than another race is an example of a
a. prejudice
b. discrimination
c. social role
d. stereotype

Such as statement would be a classical example of a stereotype (it would be infact an act of racism to say something like that!) - D. When we usually talk about races in such a manner we're implying there are certain universal rules as to how races differ between each other. It would be the same as saying that Asiatic people are good at mathematics for example.