Official Solution:
Every successful entrepreneur is self-motivated and independent. People who have a marketable idea but lack entrepreneurial spirit lack these two traits. Also, every successful entrepreneur is well-known within their industry.
If the statements above are true, which of the following must be true?
A. Anyone well-known within an industry can become a successful entrepreneur.
B. Someone with a marketable idea will become a successful entrepreneur if they develop entrepreneurial spirit.
C. In a little-known industry, no one can be a successful entrepreneur.
D. Having a marketable idea, by itself, does not ensure that a person will be a successful entrepreneur.
E. Self-motivation and independence are the only characteristics that define entrepreneurial spirit.
Choice A: Incorrect. This answer choice commits a reversal: the premises establish that
every successful entrepreneur is well-known within the industry (and thus that
anyone unknown will not be successful), but they do not establish that being well-known is sufficient to become a successful entrepreneur.
Choice B: Incorrect. This answer choice asserts a sufficiency the argument never provides. From the premises we know that
successful entrepreneurs are self-motivated and independent, but we are not told that having entrepreneurial spirit (plus a marketable idea) is enough to ensure success.
Choice C: Incorrect. This answer choice introduces a variable outside the scope—the notoriety of the
industry itself. The statements require only that the
person be well-known within the industry, not that the industry be well-known.
Choice D: Correct. This answer choice must be inferred. The passage describes people who have a marketable idea but lack entrepreneurial spirit as lacking the traits that
all successful entrepreneurs have, so a marketable idea by itself cannot guarantee success.
Choice E: Incorrect. This answer choice adds an out-of-scope claim that self-motivation and independence are the
only or “most defining” traits of entrepreneurial spirit; the premises do not rank or exhaustively define its characteristics.
Answer: D