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Step-by-step explanation:
Here is your answer=> A. by twirling
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(A) By twirling
More information:-
The thaumatrope is the most basic of motion toys. It consists of a disc that is attached to two pieces of string. When twirled, the images on the sides of the disc are perceived together as a single image. Like all animation devices, the thaumatrope works on the principle of persistence of vision.
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