Suppose we compare the combined mass of a C atom and an O2 molecule, both at rest, with the mass of a CO2 molecule, also at rest. According to Einstein's theory, the combined mass of the C and O2 is
A) slightly less, by an amount so small that it hard to measure, than the CO2 molecule's mass.
B) precisely equal to the CO2 molecule's mass.
C) considerably more than the CO2 molecule's mass.
D) considerably less than CO2 molecule's mass.
E) slightly more, by an amount so small that it hard to measure, than the CO2 molecule's mass.
E
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