When naming a transition metal ion that can have more than one common ionic charge, the numerical value of the charge is indicated by a _

Superscript after the name
Suffix
Prefix
Roman numerals filling the name

Roman numerals filling the name

Explanation:

The transition metal is elements that are located in groups 3- 12 of the periodic table. One of the traits that transition metal has is that they have two or more oxidation state

The example for this is aluminum, you might read that it's written as Aluminum(III) when the ion has +3 charge. While +3 is the most common oxidation state, aluminum can be at +2 state or +1 state.

answer is a

explanation: