Exception and Copy Constructor : C++

throw c;     

Creates a temporary object and it is this temporary object that is thrown. The creation of the temporary might be through copy/move constructor. And yes this copy/move can be elided.

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References:
C++11 15.1 Throwing an exception

§3:

A throw-expression initializes a temporary object, called the exception object, the type of which is determined by removing any top-level cv-qualifiers from the static type of the operand of throw and adjusting the type.........

§5:

When the thrown object is a class object, the copy/move constructor and the destructor shall be accessible, even if the copy/move operation is elided (12.8).