Chemistry

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Consider the gas-phase equilibrium A ⇌ B. In a series of experiments, different initial
amounts of A and B are mixed together, and the mixture in each case is allowed to come to
equilibrium. Which one of these experiments would yield values for the amounts of A and B
present at equilibrium different from all the other experiments?
a. 3.0 moles A, 4.5 moles B
b. 4.5 moles A, 3.0 moles B
c. 1.5 moles A, 4.5 moles B
d. 7.5 moles A, no B
e. 0.5 moles A, 7.0 moles B

The answer is given as C....but I have absolutely no idea what is going on here....

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