azhar
Goats are world’s best grassland grazers by eating away almost all of the plants other than grass including poisonous plants in prairies and pastures. Grass is the last choice of these cattle, although they may damage some useful plants that are left unprotected. Goat’s saliva contains an array of enzymes that neutralize the poisons in the plants. It also contains chemicals that stop the growth of unwanted plants. In addition, they enrich the pastures by their excretions, making the grass grow more vigorously. Also we cannot forget the high quality protein meat and quality milk they give us. Thus goats are undoubtedly one of the best environmentally, economically, and socially valuable animals of our planet.
Which of the following would be most useful to determine in order to evaluate the argument?
A. Whether goats all over the world have such a plant growth limiting action?
B. Whether any animals other than goats possess such capabilities comparably?
C. Whether the chemicals that goats possess can also destroy useful plants other than grass?
D. Whether grass can get damaged while the goats are grazing unwanted plants?
E. Whether the meat and milk are as good as cow’s or buffalo’s products?
Before wanting to solve this question, let's keep these facts in front.
1. Damaging is not the same as destroying. The prompt talks only of damage to some useful plants but not of destroying them. Destroying means total annihilation and those plants cannot re-grow. Damage means they can regenerate. This is the concept behind trimming a plant
2. It has been clearly stated that the chemicals the goats possess neutralize the poison possessed in poisonous plants and stop the growth of unwanted crops. On the contrary, these chemicals do not affect useful plants since useful plants do not possess poisons. The small external damages these useful plants suffer are reversible.
Choice D is not even in the picture because grass is a useful plant, and as long as the goats do not over do it, one can't claim that grazing is a damage, especially when grass is the last choice of the cattle. B is also not in the reckoning as goats have already been declared as one of the most valuable animals meaning that there are also some other equally valuable animals. There is no point in re-evaluating a closed matter.
C on the contrary challenges that if somebody can prove that the chemicals can destroy useful plants against the normal belief, then one can raise a banner of revolt against the argument. That is how we can evaluate whether goat is one the most valuable or less valuable animals.
C is the answer.