Analysts Are So Bullish on Facebook's Mobile Advertising Prospects Because

Multiple Choice

Analysts are so bullish on Facebook's mobile advertising prospects because

A) Mobile ad revenue from the Facebook app has grown steadily since the firm's IPO.
B) Instagram is new to advertising and WhatsApp hasn't advertised much, suggesting that Facebook has lots of unrealized growth potential in its app stable.
C) Ads on Facebook mobile show up in a user's feed, the area of the screen they pay most attention to, suggesting mobile ads will be tougher to ignore than those on the side of a browser screen.
D) All of the above
E) None of the above - analysts remain very pessimistic about Facebook's prospects for mobile advertising.