What is the period of the element with atomic mass referred to the isotope 12 of Carbon? I - The table shows the classification of the elements ac...

What is the period of the element with atomic mass referred to the isotope 12 of Carbon?

I - The table shows the classification of the elements according to their atomic mass.
II - The element with atomic mass referred to the isotope 12 of Carbon is not identified in the table.
III - The element with atomic mass referred to the isotope 12 of Carbon is located in the first period.
a) Only I is correct.
b) Only II is correct.
c) Only III is correct.
d) I and III are correct.
e) II and III are correct.