A.I. Explanation:

Option 1: "Zebras are not as similar to horses as they initially appear."

Explanation: While the text mentions that zebras are members of the horse family, it does not conclude that they are dissimilar. The focus is on their riding capabilities rather than their overall similarity to horses.

Option 2: "People have little motivation to develop a zebra that could be ridden."

Explanation: The text states that with the arrival of the internal combustion engine, there has not been much incentive to breed zebras for riding. This directly supports the conclusion that motivation is lacking.

Option 3: "It is unlikely that people could develop a zebra that would be good to ride."

Explanation: The text suggests that it is possible to breed zebras that could ride well, contradicting the idea that it is unlikely. Therefore, this option misrepresents the text's implication.

Option 4: "Motorised vehicles are gradually reducing the numbers of zebras that are being bred."

Explanation: The text does not mention any reduction in zebra numbers due to motorized vehicles. It only discusses the lack of incentive to breed zebras for riding, making this option irrelevant.