Which statement from the passage MOST requires further supporting evidence?

A "On the other hand, most consumers have already
decided whether to make the purchase by the time
they see the ad."
B "Research data have revealed that few people
actually take the bait and instead 'click through
when they encounter an ad."
C "These days, people can learn about products
through online user reviews, comments, and
price-comparison charts."
D "Studies conducted by one prominent social media
website show that ads did not get many clicks at
all."