21. Which of the following frequencies corresponds to light with the longest wavelength?
(A) \( 3.00 \times 10^{11} \text{ s}^{-1} \)
(B) \( 4.12 \times 10^{6} \text{ s}^{-1} \)
(C) \( 8.50 \times 10^{10} \text{ s}^{-1} \)
(D) \( 9.12 \times 10^{11} \text{ s}^{-1} \)

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