In 1961,the Reference for the Atomic Mass Unit (Amu or U)was

In 1961,the reference for the atomic mass unit (amu or u) was changed from naturally occurring oxygen with a value of 16.000 u to one based on a single isotope of carbon (carbon-12) .Why was it changed?

A) The atomic composition of oxygen varies depending upon its source.
B) Carbon-12 is more common than oxygen.
C) Carbon exists as only one isotope, carbon-12.
D) Carbon can combine with four atoms of hydrogen to form CH₄, methane, while oxygen only combines with two atoms of hydrogen to form water, H₂O.

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