Identify the segment in the sentence which contains a grammatical error.
It is time someone takes concrete steps to alleviate the problem of unemployment in the country.

Correct option is D

Option (d) contains the grammatical error.
Explanation: The phrase "It is time someone takes" is incorrect. The correct structure after "It is time" requires the use of the past tense, so it should be "It is time someone took concrete steps." This usage implies that the action is overdue and should have been taken already.
Correct Sentence: It is time someone took concrete steps to alleviate the problem of unemployment in the country.
Grammatical rule used: When using the phrase "It is time," the verb that follows should be in the past tense to convey that the action is necessary or overdue.
Example: It is time we left for the meeting.