Answer:
C). Ostriches are known for their size and their great speed.
Explanation:
A Stereotype is defined as a conventional and often oversimplified conception, opinion, or image of a person or thing. It is a belief or opinion that is held by a wide range of people which is not necessarily true and leads to ignorance of individual differences.
In the given question, the third sentence 'Ostriches...speed' most clearly employs a stereotype as it makes an overgeneralized image of Ostriches that they are known for their size as well as speed which is untrue as the Ostriches are more known for their flightless features. Thus, option C is the correct answer.
