Sentence Correction

Very popular from 1900 until the 1920's, the renewed interest in ceiling fans began when the energy crisis in 1974 forced homeowners to look for alternative methods of heating and cooling.
(A) Very popular from 1900 until the 1920's, the renewed interest in ceiling fans began
(B) The renewed interest in ceiling fans, which were very popular from 1900 until the 1920's, began
(C) After they were very popular from 1900 until the 1920's, the renewed interest in ceiling fans was beginning
(D) Ceiling fans were very popular from 1900 until the 1920's, with renewed interest beginning in them
(E) From 1900 until the 1920's ceiling fans were very popular, and now the renewed interest in them has begun

(A) Very popular from 1900 until the 1920’s, the renewed interest in ceiling fans began [modifier error. the renewed interest was not popular from 1900 to 1920. Eliminated!]

(B) The renewed interest in ceiling fans, which were very popular from 1900 until the 1920’s, began [Correct. My answer]

(C) After they were very popular from 1900 until the 1920’s, the renewed interest in ceiling fans was beginning [modifier error. Eliminated!]

(D) Ceiling fans were very popular from 1900 until the 1920’s, with renewed interest beginning in them [what does 'them' refer to? it seems to be referring to the ceiling fans. Eliminated!]

(E) From 1900 until the 1920’s ceiling fans were very popular, and now the renewed interest in them has begun[wrong use of tense. present perfect is not required here. we need a past tense to talk about an event that occured in 1974. Eliminated!]

Hope this helps!

IMO B as well

My vote on B as well

IMO -- B

As explained by FIBO