The correct option is B Gymnosperms are dominant plants and first birds appear
The Jurassic Period was the second segment of the Mesozoic Era. It occurred from 199.6 to 145.5 million years ago, following the Triassic Period and preceding the Cretaceous Period. The most important event in this period include dominance of reptiles, gymnosperms continue as dominant and origin of toothed birds (first birds). Hence option B is correct.