Sentence Correction (SC) | Analysts blamed May's sluggish retail sales on unexciting

Analysts blamed May's sluggish retail sales on unexciting merchandise as well as theweather, colder and wetter than was usual in some regions, which slowed sales of barbecue grills and lawn furniture.

A. colder and wetter than was usual in some regions, which slowed - which incorrectly refers to regions
B. which was colder and wetter than usual in some regions, slowing - Correct
C. since it was colder and wetter than usually
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