Answer:
Correct answer is English is the primary language .
Step-by-step explanation:
First option is not correct as they were colonized much earlier, especially United States and Canada, while Australia was colonized a bit later as it was discovered later.
Second option is not correct as actually Protestantism is the dominant religion in most of the these countries.
Climates are totally different as Canada and United States are in the northern, while Australia is in the southern hemisphere.
English is the primary language as this areas were mostly colonized and settled by Great Britain.