A drug that is highly effective in treating many types of infection can,at present,be obtained only from the bark of the ibora , a tree that is quite rare in the wild. It takes the bark of 5000 trees to make one kilogram of the drug. It follows, therefore, that continued production of the drug must inevitably lead to the ibore's extinction. Which of the following,if true, most seriously weakens the arguments above ?



The drug made from the ibora bark is dispensed to doctors from a central authority
The drug made from the ibora bark is expensive to produce
The leaves of the ibora are used in a number of medical products
The ibora can be propagated from cuttings and grown under cultivation

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