Discussion
The Yilgarn shield and Pilbara shield comprises significant part of the older cratonic shields of the continent :
Answer: A
The Yilgarn and Pilbara cratons are in Australia.
Both are Archaean cratons in Western Australia. The Pilbara contains some of the oldest well-preserved crust and early evidence of life, about 3.5 Ga, and the larger Yilgarn, about 3.0-2.6 Ga, hosts major gold and nickel deposits, including those around Kalgoorlie.
Africa's Archaean nuclei are the Kaapvaal and Zimbabwe cratons, South America's the Amazonian and Sao Francisco, and Canada's the Superior and Slave, so the other continents are wrong.
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