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States cannot force associations to accept members
        
                    
             
        
        
        
Answer:A. Companies use investments to pay for services that improve their  productivity.
Explanation: 
The best description of the relationship between investments and productivity is that A. Companies use investments to pay for services that improve their  productivity.
Investments made by companies include:
Increasing the production capacity factories
Buying more efficient machinery and equipment
Hiring more people
All of the above are needed to improve productivity which means that if a company wants to improve its productivity, it will need to make investments that enable it to do so.
In conclusion, investments are needed to increase productivity.