My answer is
(D). It took me 01:16.
(A) When I read the sentence, I thought come close to (doing) something is the idiomatic use.
(Indeed, it is. Check
https://www.macmillandictionary.com/us/ ... -something)
But I am not 100% sure. Fortunately, this sentence uses "come close to
creates", which is absolutely wrong.
I, however, think it is a typo.
(B) Verb is missing in the relative clause (that hand-made effects pedals providing).
(C) Verb is missing in the main clause (only some of these products managing ).
(D) No issues found. "few of" is shorter than "hardly any of", though.
(E) In reading (E), we do feel that the transition from "although" subordinate clause to the main clause is not as smooth as (D). “some of these products” should better be placed closer to the subordinate clause.
Also, mixing singular " a hand-made effects pedal" with plural "some of these products" might be a style issue.