A Which of these sentences is written correctly?
A Increasing levels of pollution causes damage to the ecosystem and has the ability to
harm many animals.
O
B The killing of elephants for their tusks have caused the elephant population to
dwindle.
O
C Amanda's exceptional writing skills and her previous work experience has made her a
prime candidate for the position.
D Improvements to the nation's educational system have become a primary source of
discussion on the campaign trail.