Theme: The grim reality of war can often be overlooked, the destruction it causes lasts a lifetime.
The statement above is based on the assumption that improved labour standards, economic achievement and social security are not always possible. The correct option is A. It can be seen from the passage that the collaboration of all countries is needed in order to secure for all improved standards, economic achievement and social security; which means that without collaboration, these things will not be achievable.
The answer is, something the reader has experienced
