members of which group easily lose an electron to form a +1 cation?\no halogens\no alkaline earth metals\no…

Brief Explanations:

Alkali metals have one valence - electron. They easily lose this electron to achieve a stable electron configuration, forming a +1 cation. Halogens gain electrons to form anions, alkaline earth metals lose two electrons to form +2 cations, and noble gases are stable and do not easily lose or gain electrons.

Answer:

D. alkali metals