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Explanation:

Option 1 is mentioned in the passage, “These third and fourth generation farmers and townspeople do not realise, however, that a new settler is coming soon with an invention as powerful as John Deere’s plow.”
Option 3 can be gleaned from the following extract, “It will be only one generation between the bereavement counsellor arrives and the community of mourners disappears. The counsellor’s new tool will cut through the social fabric, throwing aside kinship, care, neighbourly obligations and community ways of coming together and going on. Like John Deere’s plow, the tools of bereavement counselling will create a desert where a community once flourished.”
Option 4 can be validated since the passage mentions John Deere to be from Illinois and the bereavement counsellor to be from the great state university. Therefore both are tools introduced by outsiders into Sauk County, Wisconsin.
Option 2, ‘migration of the communities,’ has not been mentioned by the author in both the cases of the introduction of the steel plow and bereavement counselling.
Hence, the correct answer is option 2.