The correct answer is option C.
In a sequentially organized research paper, the even that comes after all the others in time of order is the one that happened in 2001.
Option A is not the last because it took place 2000 years before now, so it would be the first to be documented in the research paper.
Option D would be second, since it happened in 1971.
Alternative B refers to 1996, so it would be the third fact in order of occurrence.