Which is a substantiated opinion?
a) one of the largest computer companies began in a garage.
b) small businesses are the reason america has a strong economy.
c) experience is the best way for entrepreneurs to learn.
d) people are often wasteful in free market societies.
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To be a substantiated opinion, you must have evidence to back it up or be able to point to something to back it up. 

A. The writer states a fact that can be checked by simply going to the large computer company and seeing where is began.

You would need a lot more evidence to prove that small businesses are the reason America has a strong economy.

Option "C" cannot be backed up with a specific fact easily.

Letter "D" would be a more generic statement.

Bwould be the answer