Concept:The oldest rocks on Earth are determined by radiometric dating of zircon crystals in ancient continental crust.Explanation:- The Jack Hills in Western Australia contain zircon crystals dated to about 4.4 billion years old.- Researchers used atom-scale analysis to confirm the age as 4.374 billion years (plus or minus 6 million years).- This makes Western Australia’s Jack Hills the oldest known rocks on Earth.- Other ancient rocks exist, such as in Canada’s Hudson Bay, but Jack Hills hold the current record.Answer:Option A: Western Australia