Concept:The camel was the main means of transport used by the Arabs in the desert.
Explanation:The desert has extreme heat, sandy terrain, and little water.
Cattle, horses, and donkeys are less suited to these harsh conditions.
Camels can survive for long periods without water.
Camels can carry heavy loads across soft sand with ease.
Their broad feet stop them from sinking into the desert sand.
This is why the camel was the most reliable transport animal for Arab travellers.
Answer:D. Camel