PROBLEM:
A. The number of false statements here is one.

B. The number of false statements here is two.

C. The number of false statements here is three.

D. The number of false statements here is four.


Which of the above statements is true?
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SOLUTION:
Option "C" is the answer: three statements are false.  Since each statement concludes that there is a different number of false statements, that proves that only one statement can be correct (hence the object is to decide which statement is true).  Given that one statement is true, by definition, the other three must be false!