In the following question, some part of the sentence may have errors. Find out which part of the sentence has an error and select the appropriate option. If a sentence is free from error, select 'No Error'.
The population of Mumbai(A)/is greater than(B)/in any city in USA.(C)/No error(D)

The error lies in part (C) of the sentence. When comparing attributes of two entities, the comparison must be logical and parallel. Here, the "population of Mumbai" is being incorrectly compared to "any city in USA" rather than the "population of any city".
To make it correct, we should use "that of" to refer back to the population.

Incorrect: ...is greater than in any city in USA.

Correct: ...is greater than that of any city in the USA.