In this question, we are given a sequence of Roman numerals: I, II, and ??? We need to determine the next figure in the sequence.

Option 1: I

This is the first figure in the sequence.

Option 2: II

This is the second figure in the sequence.

Option 3: III

This is the correct answer. III is the Roman numeral representation for the number 3, and it follows the pattern of the previous figures.

Option 4: IV

This is not the correct answer. IV is the Roman numeral representation for the number 4, which does not fit the pattern of the previous figures.

Therefore, the correct answer is option 3, III, as it follows the pattern of the previous figures in the sequence.