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Half of line has arrows or fins pointing outward. The remaining half has arrows or fins pointing inward. The first half looks longer than the second half. This is the ______________ illusion?

Half of line has arrows or fins pointing outward. The remaining half has arrows or fins pointing inward. The first half looks longer than the second half. This is the ______________ illusion?

A. Zollner
B. Wundt
C. Muller-Lyer
D. Poggendroff