The correct statement about Australia is ; It experiences the first day of summer at Position 1 and first day of winter at Position 3.
The southern and northern hemisphere experiences winter and summer at different times of the year because the Earth's axis remains fixed ( almost ) when it orbits around the sun. therefore during the different orbit phases either the northern hemisphere or southern hemisphere faces/leans towards the sun.
The part of the earth ( hemisphere) that faces the sun will experience its first day of Summer while the hemisphere that leans away from the sun will experience its first day of winter.
Hence from the diagram we conclude that Australia been in the southern hemisphere will experiences the first day of summer at Position 1 and first day of winter at Position 3.
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