Many people who used to work crossword puzzles

A type of puzzle - is a noun + modifier.
Since there is only one singular noun between the types mentioned, I hope a type of puzzle refers to Sudoko.

hence, My go is with A

Found no error in A so IMO it is the correct answer.

Well this is really interesting

(A) Many people who used to work crossword puzzles now prefer Sudoko, a type of puzzle that relies on logic instead of knowledge of obscure words.
Correct
(B) Many persons who used to work crossword puzzles now prefer Sudoko, one of the types of puzzle that rely on logic instead of knowledge of arcane words.
Uses rely for singular subject one of (Subject -verb agreement) incorrect
(C) Many people who used to choose to work on crossword puzzles now choose to prefer Soduko, a type of puzzle that relies on logic instead of knowledge of obscure words.
Between a and c , c is more wordy or choose to prefer is more repetitive means same thing)
Incorrect
(D) Many who worked crossword puzzles now do Sudoko, it uses logic instead of obscure words.
Incorrect pronoun error it
(E) Many people have chosen to try Sudoko, which uses logic instead of crossword puzzles, which relies on knowledge of obscure words.
Incorrect. changes meaning.

Answer- A