6 to the power of 12C
How many protons are in this isotope

 If you look on the periodic table, you'll see that carbon has an atomic number of 6 6 66. This tells us that carbon- 12 12 1212, like any isotope of carbon, has six protons in its nucleus. Using unified atomic mass units makes the masses of these particles much easier to understand and compare.

A molecule is the smallest part of a compound. So, B. Would be your answer.

Hope I helped!