Read the passage and answer the question.

Nearly two thousand five hundred years ago, there lived a king called Alexander the Great. He was the son of Philip II of Macedonia. When Prince Alexander was a boy, a magnificent horse that was for sale was brought to the court of his father. The animal was to be sold for thirteen talents. Talents are ancient coins. Many were eager to buy the horse, but no one could get close enough to saddle the restless animal. He was wild and impossible to ride.

Alexander pleaded with his father to let him try. Realizing that the horse was terrified of its own shadow, he turned the horse towards the sun so that its shadow fell behind it. This calmed the horse, and the prince proudly rode away. Observing this, his father said, “My son, look for a

kingdom worthy of your greatness. Macedonia is too small for you.”

That is exactly what Alexander tried to do when he grew up. He fought many battles and always rode Bucephalus (that was the horse’s name.) Friendship and trust grew between the man and his horse. When Bucephalus died of wounds received in battle, Alexander was heartbroken and deeply mourned the loss of his horse.

According to the passage, why do you think the horse was unrideable and wild?