Final answer:
The use of the word 'hostility' rather than 'unfriendliness' in the context of the Internet emphasizes the level of dislike that can develop among people online.
Step-by-step explanation:
The use of the word 'hostility' rather than 'unfriendliness' in the context of the Internet impacts the ideas the author is creating about the Internet by illustrating the level of dislike that can develop among people on the Internet. The word 'hostility' implies a deeper and more intense negative feeling towards others, indicating that interactions on the Internet can lead to strong animosity and aggressive behavior. This contrasts with the word 'unfriendliness', which suggests a milder form of negative attitude or lack of warmth. Therefore, option C) - It illustrates the level of dislike that can develop among people on the internet - is the correct answer.