A \( 4.2 \times 10^{-4} \text{ M} \)
B \( 4.2 \times 10^{-2} \text{ M} \)
C \( 4.2 \times 10^{2} \text{ M} \)
D \( 4.2 \times 10^{4} \text{ M} \)
Correct Answer: Option A
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