Step 1: Analyze the Conservation Status of Each Species:
We need to identify species that are considered threatened (Endangered, Vulnerable, etc.) or are of significant conservation concern in India.
I. \textit{Corvus splendens} (House Crow): Abundant, Least Concern (LC).
II. \textit{Panthera tigris} (Bengal Tiger): Endangered (EN). Highly protected under Wildlife Protection Act (Schedule I).
III. \textit{Oryctolagus cuniculus} (European Rabbit): Domesticated/Least Concern.
IV. \textit{Antelope cervicapra} (Blackbuck): Near Threatened (NT). Protected under Schedule I of WPA, 1972. Historically threatened by hunting.
V. \textit{Loris tardigradus} (Slender Loris): Endangered (EN).
VI. \textit{Macaca mullata} (Rhesus Macaque): Least Concern (LC).
Step 2: Select the Group:
The group containing the species of high conservation concern is II (Tiger), IV (Blackbuck), and V (Slender Loris). The other lists contain common animals like Crows and Rabbits.
Step 3: Final Answer:
The correct combination is II, IV, V.