You are correct in your assumption. The kind of fossil that has been described in the question is Crystallization. It is also called crystallized fossil. The correct option among all the options that are given in the question is the second option. I hope that this answer has come to your help.
because Wakanda was hiding all the Vibranium....honestly cos it's a third world country, and when they had the chance to like....build a better society, they got enslaved
