Is It Possible That the Carbon Atoms in Your Body

Multiple Choice

Is it possible that the carbon atoms in your body may have once made up the living tissues of another person or animal in earlier times? This is

A) possible only if you are a cannibal.
B) possible since carbon cycles through the biosphere.
C) impossible since carbon can't enter a living system more than once.
D) highly unlikely since carbon is always tied up in molecules in organisms or minerals.