In the question "Which element has the fewest valence electrons available for bonding?" The correct answer is Aluminum.
Iodine is a group 7 element and thus has 7 valence electrons available for bonding.
Aluminum is a group 3 element and thus has 3 valence electrons available for bonding.
Carbon is a group 4 element and thus has 4 valence electrons available for bonding.
Nitrogen is a group 5 element and thus has 5 valence electrons available for bonding.