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 function of the infinitive phrase in the sentence <em>To win a marathon is my goal </em>is object of the verb.
It is definitely an object, and it would follow a verb if it were a normal ordering of words in the sentence (My goal is to win a marathon), and since it is not preceded by a preposition, it cannot be object of the preposition, but of a verb.
        
                    
             
        
        
        
How many light bulbs we talking about here?
        
             
        
        
        
 The answer is A. The phrase “stroller-driving moms and crying babies” helps create the irritated mood.