Answer:
The total contribution towards the GDP from all this series of transaction would be B) $1200
Explanation:
GDP means the gross domestic product , in which we include market value of all goods and services that were produced in the economy during defined period of time.
Here the total contribution to GDP would be $1200 because in the end the product that was made was dress with help of cotton , cloth etc, it was the final product that was produced in the economy , that's why only $1200 would be included in the contribution towards economy.