The answer is: [C]: " 2⁴ " .
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Explanation:
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The ratio of outputs is: 4:(1/4) = 4:(1/4) = 4 ÷ (1/4) = 4/1 * 4/1 = 16/1 = 16:1 = 16.
From the answer choices given, "2⁴ = 16" ; since: " 2*2*2*2 = 16 ";
which corresponds to:
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"Answer choice: [C]: " 2⁴ " .
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