I = 1
II = 1 + 1 = 2
V = 5
VI = 5 + 1 = 6
IV = 5 - 1 = 4
X = 10
A. XVIII = 10 + 5 + 1 + 1 + 1 = 18
B. VII = 5 + 1 + 1 = 7
C. XXVII = 10 + 10 + 5 + 1 + 1 = 27
D. XVII = 10 + 5 + 1 + 1 = 17
Answer: D. XVII
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