If the figure for animal cruelty had not risen by 6.6% to 566 and had stayed the same as the year before, then number of people convicted = 531 (Given in the passage).
If the trend for animal cruelty conviction was the same as that of the rest of England and Wales and the figure had decreased by 11.7% (≈12%), number of conviction in North England in 2013 = 88% of 531 = 467
This is a decrease of = 566 – 467 = 99
Number of total convictions that would have been if North England had followed the same trend as the rest of England and Wales in 2013 = 1371 – 99 = 1272
This is closest to 1274. So B is the answer.