The difference between the antelopes Oryx and Chiru is:
Oryx is adapted to live in hot and arid areas, whereas Chiru is adapted to live in the steppes and semi-desert areas of cold high mountains.
Oryx is poached for its meat, hides, and horns, whereas Chiru is poached for its fine wool, which is used to make shawls.
Oryx is found in Africa and the Arabian Peninsula, as well as in some parts of western India, while Chiru is found only in the Tibetan Plateau in the northeastern part of India.
Therefore, option A is the correct answer.