Why Are Most People Not in Favor of Practices Such

Why are most people not in favor of practices such as "scraping" or the use of cookies?

A) They are not considered to be effective advertising forms.
B) They raise the prices of goods and services because they are expensive to execute.
C) The practices invade our personal privacy.
D) People do not understand them,and we tend to dislike what we do not understanD.