LIC AAO 20 Feb 2023 Paper

Read the following sentence and determine whether there is an error in it. The error, if any, will be in one part of the sentence. If the sentence is error-free, then select ‘No Error’ as your answer.
The hawkers have been carrying (A)/ out their business on the main (B)/ pavement since three years (C)/ but no one has ever objected. (D)