In several African countries where the rhinoceros was once a thriving species, the animal is now nearly extinct. In most of these nations, rhinoceros horns are used as traditional ingredients in certain medicines. Rhinoceros farming has been proposed as an alternative to the imposition of stiff penalties on people who are caught engaging in rhinoceros hunting. The imposition of stiff penaltiesA. reduces the supply of rhino horns.B. makes poaching more lucrative.C. increases the price of rhino horns.D. All of the above are correct.E. B & C only are correct.

In many places, rhinoceros are illegal hunted down and their horns are illegal black market at a very high price. It is believed that the rhino horns have some medicinal value.

In the context, in several South African countries, the government have imposed heavy penalties on people who are caught in hunting of the rhinoceros. Thus this imposing of the penalties will increase the cost of the rhino horn in the black market, it will also makes the poaching business more lucrative as the demand on the horns and the cost of the hunters will be more. Penalties will also effect the supply of the rhino horns as many people will now stop poaching the rhinos. Thus the supply will decrease.

Therefore the correct option is (D).