By saying that "Coke has hardly been sitting on its thumbs" , the author means that ______
A.it is impossible for Coke to be indifferent to the situation
B.it is difficult for Coke to get out of the failures and reverse the situation
C.Coke can't be the best forever and it is losing its share to Pepsi
D.Coke has realized that it should learn from others to improve itself