The answer is d. The Shelbyville Whoopee Cushion company makes 1000 to export to China. The reason it will affect the GDP or Gross Domestic Product of the country is partly because of the volume of cushions being sold multiplied by the unit price with an answer in the $1000's of dollars plus it is a transaction between a business and another country ie an export. The purchase of the Picasso painting would if an original also be worth a lot of money so could affect the GDP as well since it involves the exchange of a product ie a painting for a large amount of money.
