PT53.S1.Q19 - people who have habitually slept

emilycyoung1

Please someone explain to me why B is incorrect and A is correct. I don't understand in the slightest bit and I have read so many explanations but still don't get it. B seems to match the reasoning in the original statement.
https://7sage.com/lsat_explanations/lsat-53-section-1-question-19/

blah170blah

(B) is incorrect because the subject of B is too broad. In the second sentence, (B) reads that "most small companies can improve their financial situations by starting to advertise." However, the subject of the sentence actually needs to be qualified with the phrase "who haven't advertised at all." (B) would be correct if the second sentence said "So most small companies who have never advertised on the Internet can improve their financial situation."