Metals generally have one, two or three valence electrons (versus non-metal that usually have five, six, seven or eight). As a result, it is easier (requires less energy) for a metal to lose it's valence electrons that it is to gain in excess of 3 electrons in order to become stable.
Thus the answer is, they tend to lose electrons easily when bonding [OPTION B].
Note; metals, because of their sea of electrons, are good conductors of both heat and electricity.
