The correct answer is "threatened".
A species which is facing the danger of being extinct in near future due to mass hunting or any other environmental or anthropogenic effect is termed as threatened species. One of the best examples of threatened species is Giant Panda.
Rest of the options are wrong because extinct means the species which have already been wiped off from the earth. Dinosaurs is also not correct answer because dinosaur is extinct species. Also, extant means the species which is present on the earth and it is not vulnerable to endangerment.