The element that would most likely lose electrons to form positive ions when bonding with other elements is C. rubidium (Rb).
Rubidium is an alkali metal, which is located in Group 1 of the periodic table. Alkali metals have one electron in their outermost shell and tend to lose that electron easily to achieve a stable electronic configuration, typically resulting in the formation of a positive ion (cations).
The other elements listed (argon, gallium, and iodine) either tend to gain electrons or are noble gases which do not typically form ions.
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