Sony Launched an Online Campaign That Prompted People to Visit

Sony launched an online campaign that prompted people to visit the Sony website. In order to evaluate the success of the campaign, Sony should

A) compare sales before and after the campaign was launched.
B) monitor web traffic during the campaign.
C) monitor the website to see if web traffic increased after the launch of the campaign.
D) compare demand before and after the campaign was launched.
E) measure sales and profitability after the campaign was launched.