A. The scale factor is 1/2
What is scale factor ?
The variable size by which the shape of a structure is decreased or increased is known as scale factor.
If, y =kx is an equation, then k is scale factor of x.
What is the required scale factor ?
Height of the original rectangle is 4 unit, whereas height of it's reduced form is 2 unit.
So, if we multiply 1/2 with the original rectangle's dimensions, then we get the dimensions of it's reduced figure.
So, we conclude that, the scale factor is 1/2
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