Choose the item that breaks the rule. A5, C7, E9, G11, I10
I10
Look at the letters: A, C, E, G, I — each skips one letter (A→C→E→G→I), so the letters follow a steady +2 rule and are all consistent.
Now look at the numbers attached. Use each letter's position in the alphabet: A=1, C=3, E=5, G=7, I=9. The number in each correct pair is the letter's position plus 4: 1+4=5 (A5), 3+4=7 (C7), 5+4=9 (E9), 7+4=11 (G11).
For I, the position is 9, so the number should be 9+4 = 13, giving I13. But the term shown is I10, which does not follow the "position + 4" rule.
Hence, the item that breaks the rule is I10.
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