A sample of calcium carbonate \( \left(\mathrm{CaCO}_{3}\right) \) ...

A sample of calcium carbonate \( \left(\mathrm{CaCO}_{3}\right) \) has the following percentage composition : Ca \( = \) \( 40 \%, \mathrm{C}=12 \%, \mathrm{O}=48 \% \). If the law of constant proportions is true, then the weight of calcium in \( 4 \mathrm{~g} \) of a sample of calcium carbonate obtained from another source will be :
(a) \( 0.016 \mathrm{~g} \)
(b) \( 0.16 \mathrm{~g} \)
(C) \( 1.6 \mathrm{~g} \)
(d) \( 16 \mathrm{~g} \)