Answer:
The scenario described, where Loudon offers to buy all the bark that Riverview Garden has available for sale, and Riverview agrees to the transaction, is an example of:
D) An output contract.
An output contract is a type of contract in which a seller agrees to sell all of its output to a particular buyer, and the buyer agrees to purchase everything the seller produces. In this case, Riverview Garden is agreeing to sell all of its available bark output to Loudon.
