Explanation:

Correct Answer is (c).The original sentence is erroneous.
Reason: The correct idiomatic expression is 'cheek by jowl’ and not ‘cheek with jowling’.
kick the can down the road (Idiom):
Meaning: Close together.
E.g.: They lived cheek by jowl in a one-room flat.
Hence ‘cheek by jowl’ should be used in place of ‘cheek with jowling’ to make the sentence grammatically correct.
Among the given choices, only option C replaces the given bold part most appropriately.
The sentence after replacement becomes:
One of the largest slums in the world is Dharavi where lakhs of people live cheek by jowl in tiny shacks.Option C is hence the correct answer.