Using the points on the diagram below,identify which combinations of these points illustrate diminishing returns to capital.Give a brief explanation to support your answer. 
Definitions:
Sale Of Petroleum
Represents transactions involving the trade or transfer of petroleum products, often underpinned by international contracts and affected by global market conditions.
Holding Tank
A container used to store substances temporarily, such as water, chemicals, or waste, until they can be properly disposed of or treated.
Purchase Contracts
Agreements between buyers and sellers detailing the terms and conditions under which goods or services are to be purchased.
Negotiable Document
A written promise ensuring the payment of a particular sum of money, either upon request or at a predetermined time, with the document specifying the name of the person responsible for payment.
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