Hello!
The answer is A) Sandwich's
Why?
Since "La Historia general y natural de las Indias" by Gonzalo Fernández de Oviedo y Valdés relates the Spanish discovers in America related to the Indian culture, we can know that Sandwich's are not described by. The sandwich is a modern "invention" and is not related to any discover by Gonzalo Fernandez de Oviedo y Valdés in America.
Checking the other options
Hammocks (Hamacas): Are mentioned as Indian native inventions used as beds and constructed using vegetal elements.
Pineapples (piñas): Are mentioned as uniques and unknown fruits at least in Europe countries. Pineapples were first discovered by Spanish in America.
Barbeque(asado): Are mentioned as Indian cooking method of bread and animal meats.
Have a nice day!