The correct answer is: C. Gross realizable value method
The gross realizable value method is a joint cost allocation method for joint products, which is based on achievable value. It allocates joint costs to joint products based on the estimated selling price of each product at the split-off point, less the estimated costs of further processing each product.
The main product cost at split off method is a joint cost allocation method that allocates joint costs to the main product based on the estimated selling price of the main product at the split-off point, less the estimated costs of further processing the main product.
The joint products value at split off method is a joint cost allocation method that allocates joint costs to joint products based on the estimated selling price of each product at the split-off point.
The net realizable value method is a joint cost allocation method that allocates joint costs to joint products based on the estimated selling price of each product at the split-off point, less the estimated costs of further processing each product and the estimated costs of disposal of each product.
The gross realizable value method is the most common joint cost allocation method because it is simple to use and provides a reasonable measure of the value of each joint product.