I think the answer will help is b
Chamberlain appeasement policy bought a valuable year to Britain to get ready for the war which was bond to come. Plus he didn't want to follow Hitler's orders.
Hope this helped :)
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B the great changes brought about when machines and factories replaced animal power and handmade goods
More factories opened and now people migrated to urban areas
<span>Federalism is a system of government in which entities such as states or provinces share power with a national government so B or C are the best bets </span>
