Which of the Following Is True of the Role of Smartphones

Which of the following is true of the role of smartphones and online advertising?

A) Advertisers are suspicious about the use of smartphones for advertising,as they offer limited access to the Internet.
B) Ads appearing on smartphones are better trusted and accepted as a source for buying information when compared to online consumer opinions.
C) Advertisers should have mobile-compatible versions of their ads,as this will help them access customers anytime and anywhere.
D) Smartphones can be used as a medium to deliver ads based on cultural targeting in the near future.
E) Smartphones are becoming increasingly ubiquitous in many less-developed countries,even though they are the last avenue to the Internet in developed countries.