Question 122 of 127 Time: 30s

In the sci-fi series 'The Invaders,' what subtle physical deformity was the most common tell-tale sign that a person was one of the disguised alien beings?

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A. They lacked a pulse or heartbeat
B. A faint, bioluminescent glow in their eyes
C. A stiff, unbending little finger
D. They were incapable of sweating
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