Potassium (K) is an alkali metal located in Group 1 of the periodic table. Alkali metals typically have one electron in their outermost energy level, which they tend to lose during chemical reactions to achieve a stable electron configuration (like that of the nearest noble gas, in this case, Argon).
Therefore, the correct response to how an atom of Potassium is likely to act during a chemical reaction is:
It will likely lose electrons.