Which of the following represents the order of 'Horse'?

The correct option is Perissodactyla.
Classification of Horse is as follows:
Kingdom: Animalia
Phylum: Chordata
Order: Perissodactyla (Odd toes)
Rhinoceros, Tapir, and Horses belong to order Perissodactyla because they possess odd toes.
Thus, option C is the correct answer.