A \( 68.4 \mathrm{~kg} \mathrm{~m}^{-3} \)
B \( 69.4 \mathrm{~kg} \mathrm{~m}^{-3} \)
C \( 168.4 \mathrm{~kg} \mathrm{~m}^{-3} \)
D \( 85.4 \mathrm{~kg} \mathrm{~m}^{-3} \)
E \( 78.4 \mathrm{~kg} \mathrm{~m}^{-3} \)
Correct Answer: Option A
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