The Mesozoic Era<span> began 252.2 million years ago, following the conclusion of the </span>Paleozoic Era<span>, and ended 66 million years ago, at the dawn of the </span>Cenozoic Era<span>.</span>
I would think it would be C
A: 14
B: 1
C: 990
D: 145 km
E: 3.4
F: 250