Oceans have absorbed approximately one-third of the excess carbon dioxide that humans have added to the Earth's atmosphere so far. This has slowed the progression of global climate change, but it has led to .

A) growth of oyster populations worldwide

B) loss of oxygen from the oceans

C) a decrease in the pH (ocean acidification)

D) an increase in the pH of the world's oceans

E) increases in growth of coral reefs