According to the IUCN Red List, the conservation status of the species mentioned is as follows:
- Tiger: Tigers are listed as Near threatened (NT) due to habitat loss and poaching. While conservation efforts are in place, they still face significant threats. Thus, (A) and (D) are incorrect.
[6pt]
- Great Indian Bustard: This species is Extinct (EX) in the wild due to hunting and habitat loss. Therefore, (A) is correct for this species.
[6pt]
- Passenger Pigeon: The Passenger Pigeon, once abundant in North America, went Extinct (EX) in the wild by the early 20th century, primarily due to hunting and habitat destruction. Therefore, (B) is correct.
[6pt]
- Blackbuck: Blackbuck is listed as Endangered (EN) due to habitat loss and hunting. This is a conservation priority in India. Hence, (D) is incorrect for this species.
[6pt]
Thus, the correct match is (B): Tiger: NT; Great Indian Bustard: EX; Passenger Pigeon: EX; Blackbuck: EN.