Calcium (Ca) has been a 2+ charged ion, this means that Your
It donated (lost) 2 electrons
It accepted (gained) 2 electrons
It donated (lost) 4 electrons
lt accepted (gained) 4 electrons

Actually Welcome to the Concept of the Chemistry.

Here, we know that, when an atom of any element, shares electron, it generates a Positive charge on itself, making itself a CATION, hence,

Answer 1.) is Correct.

==> It donated (lost) 2 electrons.

its not minor, got it wrong.