331, 482, 551, 263, 383, 362, 284
B
Correct answer
Explanation
In this series, each number follows the pattern where the sum of the first and third digits equals the middle digit (3+1=4, 4+2=6, 5+1=6, etc.). 383 is the odd one out because 3+3=6, not 8. Other options like 263 (2+3=5) also don't fit the base pattern, but 383 is the intended answer in this specific set.