求解ECON MC 2條

Q.1
BOTH elephants and cows are animals which have commercial value.However ,plephants face the threat of extinction while cows do not.This is because
A.the price of elephant tusks,compounded by international prohibition of trade ,is not high enough
B. elephants are usually wild animals while cows are raised by people
C.being large in size,elephants are easy targets for hunters
D.ALL of the above

Q.2
If the law of diminishing marginal productivity does not hold,
A.with a small wheat farm,one could add successive fertilizer and labour to produce enough wheat to feed the world
B.with a constant wage level,all workers would participate in farming
C.the marginal productivity theory will not be affected.
D.all of the above

求咁多位高手請教
及詳細解釋
小弟謝過1000次!