Answer:
E. Metallic bonds form because electrons can move freely among the metal atoms.
Explanation:
Your fourth image states that the valence electrons of a metal <em>move freely among the neighbouring metal atoms</em>.
A. is wrong because both your second and fourth images tell you that when atoms form metallic bonds they <em>neither gain nor lose electron</em>s.
B. is wrong because a metal <em>does not contain anions</em>.
C. is wrong because only metals form metallic bonds. A metal reacts with a nonmetal to form an <em>ionic bond</em>.
D. is wrong because an alloy of <em>two different metals can form metallic bonds</em>. For example, brass is an alloy of Cu and Zn. Its atoms form metallic bonds.
