please answer this question

Dear student,
 

The atomic mass unit (abbreviated as amu or simply u) is a unit that is used to express the atomic masses of atoms and molecular masses of compounds. One atomic mass unit is a mass unit equal to exactly one twelfth (1/12th) the mass of one atom of carbon-12.

The atomic masses of all elements have been found relative to an atom of carbon-12.

Hence, the correct option is (c).

Regards

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