Norway has stolen a march over other developed countries by_______that it would reduce 40% of its greenhouse gas emissions by 2020 and ____carbonneutral by 2030

'Steal a march on is an idiom' meaning Gain an advantage over (someone) by acting before they do.So,the sentence should give a meaning that Norway has reacted before its fellow nations(in doing something) and is going to perform the necessary action in-order to become carbon-neutral in future . B can be eliminated as grew is past tense for grow . D can be eliminated because verb +ing form is used only when there are two simultaneous actions.also perceiving means getting conscious of something and cannot be used here. A can be eliminated as to allow means to let some body else to do it .between Cand D D is correctly expressing the idea.