Firstly, for numerical abstraction such as
percentage, figure, rate, quantity, ... we consider
uncountable. So "as much as" is correct.
Secondly, the structure should be
parallel, "are subscribed to RSS" // "are subscribed to the WSJ"
Let examine each answers:
A recent survey regarding the use of the Internet by the nation’s top business leaders found that nearly ninety-five percent of them are subscribed to business-related RSS feeds, almost
the same as the number of those who have subscriptions to The Wall Street Journal.
1. the same as the number of those who have subscriptions to
- WRONG - "95% of them" is plural, but "the number of..." is singular; the structure is not parallel2. similar to the number who subscribe to
- WRONG - same reason as A.3. equivalent to those who have subscriptions for
- WRONG - equivalent is used to compare things, characteristic, not people. For example, he is equivalent to me, sounds weird, right?4. as much as the number of those who subscribe to
- WRONG - same reason as A + not parallel: "are subscribed" and "subscribe to" are not parallel.5. as much as are subscribed to
- CORRECT Hope it helps.
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kudo if my post helps! Thank you.