The best reason that leads to a larger gap between organ demand and supply is
A.
in prosperous and middle-income countries, more and more people die of various diseases.
B.
in prosperous countries, the supply of organs reduces for the fewer traffic accident deaths.
C.
there is a larger and larger demand while the supply seems to become less and less.
D.
more and more nations begin to take measures to ban the once legal sale of organs.