The half-life of \( { }^{223} \mathrm{Ra} \) is 11.4 days. How much of a \( 200.0 \mathrm{mg} \) sample remains after 600 hours? Select one: A. \( 43.8 \mathrm{mg} \) B. \( \quad 6.04 \mathrm{mg} \) C. \( 0.219 \mathrm{mg} \) D. \( 21.9 \mathrm{mg} \) E. \( .0302 \mathrm{mg} \)
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