Aluminum typically loses 3 electrons when it forms an ion. So the correct answer is c) lose 3.
To explain further, aluminum is located in group 13 of the periodic table. It has three valence electrons in its outermost shell. When aluminum atom forms a positively charged ion, or cation, it loses these three electrons to achieve a stable electron configuration, resembling that of the nearest noble gas, neon. This loss of electrons makes aluminum positively charged with a charge of +3 (Al3+).