Can anyone in this prove that string theory is real?

In physics, string theory is a theoretical framework in which the point-like particles of particle physics are replaced by one-dimensional objects called strings. It describes how these strings propagate through space and interact with each other. ... Thus string theory is a theory of quantum gravity.
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The best evidence for String Theory is that it is a theory that is a consistent quantum mechanical theory that at long distances reproduce. So String Theory was a complete theory of Quantum Gravity. The absence of other theories is the best evidence for String Theory.

Yes you are right the correct answer is b