How many miles of c atoms are present in a sample of 3.85x1024 c atoms?

number of moles = 6.393 moles

Explanation:
One mole of any substance contains Avogadro's number (6.022 * 10^23) of atoms. 
Therefore, to know the number of moles that contain 3.85 * 10^24 atoms, all we have to do is cross multiplication as follows:
1 mole > 6.022 * 10^23
?? moles > 3.85 * 10^24
number of moles = (3.85 * 10^24 *1) / (6.022 * 10^23)
number of moles = 6.393 moles

Hope this helps :)

Ibelieve it is b. proton.hope my answer has you : )

Radioactive fallout is a result of the fission creation used to ignite the thermonuclear fusion reaction.