Added OA: C..I marked B. However, not really convinced with C.
Anyways, OE is as follows:
Explanation:
a) Not enough information to infer that customers and advertisers believe the Internet is the place where business is going to shift "entirely" to in the near future. They might believe it is a growing channel.
b) Statements just mention skeptics, from this we cannot infer that there are "many" who are not convinced.
c) Correct. Analysts believe that the current increase in revenues for online businesses is a long term trend and refute the arguments of skeptics by saying that the earlier bust was because of "companies rushing to the net without getting the fundamentals for success of their businesses right and not the online business model itself". Which implies that it is not so this time around.
d) No information to support this inference.
e) No information to support this inference, companies might be generating revenues. through the Internet but we cannot infer that a majority of the revenue is being generated through the Internet.