Mjoy got the answer incorrect! The answer you are looking for is C. soil, why is because there are many other planets that have ice caps. Earth is the only planet that utilizes soil which makes it unique.
Cryptomnesia can occur due to source-monitoring error, where <u><em>unintentional</em></u><u><em> </em></u>plagiarism takes places.
I believe the answer is b
