Comprehend key vocabulary:Many of the city's narrow streets have been _.

Explanation

Option A: Distinguished means to be very successful and therefore it can't be used in this sentence.Option B: The streets were narrow so therefore they can be widened hence this is the correct answer.Option C: Rehabilitated means to return something to its former condition so it would not make sense to return narrow streets to their former narrow condition.Option D: Single things can be doubled but narrow things can be widened hence this is not the best option.