Choose the most suitable option to replace the highlighted part of the sentence: A part of the rural population are migrated to the cities.
A part of the rural population has migrated
The sentence 'A part of the rural population are migrated to the cities' contains two errors: subject-verb agreement and voice.
For agreement, the head of the subject phrase is the singular noun 'part' ('A part of ...'), and the verb must agree with the head, not with the nearer noun 'population'; hence a singular verb is required, not 'are'.
For voice, 'migrate' is an intransitive verb: the movement is performed by the movers themselves and takes no object, so it cannot be made passive. Forms like 'are migrated' or 'were migrated' are therefore ungrammatical.
Because the movement has already happened and its result (people now living in the cities) continues into the present, the present perfect 'has migrated' is the right tense.
Option A misspells the subject as 'A parts', breaking singular agreement; option B wrongly pluralises the uncountable 'population' to 'populations have'; option C keeps the invalid passive 'were migrated'.
Only option D fixes both faults with a singular verb and the correct active present perfect.
Hence, the correct replacement is A part of the rural population has migrated.
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