In the following question, some parts of the sentence may have errors. Select the option that has the error. If the sentence has no error then select 'No Error'.
After a stay of several years abroad he has returned back to Delhi.

Correct option is D

Option (d) contains an error.
The word "returned" itself means “came back,” so adding "back" is redundant. The correct phrasing should be "he has returned to Delhi."
Correct sentence: After a stay of several years abroad, he has returned to Delhi.
Grammatical rule used:
Avoid redundant expressions—where a word unnecessarily repeats the meaning of another.
Example: “Revert back” is also incorrect. Correct usage is: “Please revert at the earliest.”
Information Booster:
Other redundant pairs include:
· advance planning (planning itself means advance)
· repeat again (repeat = again)