A Point of Understanding Online Consumer Behavior Is Essentially To

A point of understanding online consumer behavior is essentially to: 

A)  catch people's attention and entice them to visit the marketer's home page. 
B)  compute a site's advertising value based on traffic, ad rates, and evaluations of the site's quality. 
C)  help bring more relevant and useful ads that are specific to consumers' wants and needs. 
D)  fine-tune a Web user's search to more relevant and specific websites.