The question below has blanks indicating that something has been omitted. Choose the set of word(s) that best fits the meaning of the sentence as a whole.
Norway has stolen a march over the developed countries by _____ that it would reduce 40% of its greenhouse gas emissions by 2020 and _______ carbon neutral by 2030.
declaring, become
Norway has stolen a march over the developed countries by declaring that it would reduce 40% of its greenhouse gas emissions by 2020 and become carbon neutral by 2030.