Recently, _____ countries have established a group of scientists to study the impact of climate change on Arctic ice ?

a)  32
b)  25
c)  20
d)  17

Scientists from 17 nations will take part in the year-long mission as they anchor the ship to a large piece of Arctic sea ice to study climate change. Scientists plan to sail the German icebreaker ship RV Polarstern into the Arctic Ocean.