In Alvarina, the demand for Aloe Vera has increased exponentially since its cosmetic properties have become widely known. The plant has long been a primary source of fodder for the livestock and now the animal breeders are finding it difficult to sustain their profit margins while feeding their livestock Aloe Vera because of its high price. They are being advised to grow their own Aloe Vera, since they own plenty of land, so as to maintain their profits from livestock business.

Which of the following, if true, raises the most serious doubt concerning the prospects for success of the solution proposed above?

A. The animal breeders could earn higher profits if they switched from breeding livestock to only growing Aloe Vera.
B. Aloe Vera requires significant quantities of water, competing with the livestock for it to the extent that the breeders will have to buy it.
C. The climate of Alvarina is not suitable for growing Malfa, a plant that could serve as fodder for the livestock.
D. Many cosmetic manufacturers now use Aloe Vera for most of their products in order to take advantage of the growing popularity of the plant.
E. The cost of growing Aloe Vera is significantly less than the price the breeders have to pay for buying it from outside.