Question

City X has extremely cold winters and relatively mild summers. where is it located? Brazil, England, Australia, or Russia

Answer 1

Brazil is in the Tropics and low temperate latitudes.  So it never has brutal winters, and the summers can get pretty steamy.

England is influenced by the Gulf Stream. So even though it's pretty far north, and it does have a lot of rain, it doesn't have extremes of winter or summer.

About 1/3 of Australia is closer to the equator than Hawaii is.  And there's hardly anywhere in Australia that's farther from the equator than Albuquerque, Little Rock, and Nashville are.  Most of Australia has very hot summers and mild winters.

City X isn't in any of these places.

Russia is the only possibility from this list of choices. Especially the huge part of Russia that's called 'Siberia'.