Which of the following most logically completes the argument? A. the fruits of the domesticated varieties are too large for birds to swallow B. C.chinense grows in the Caribbean islands under climatic conditions very similar to those under which the wild variety grows C. the peppers are an important part of the Caribbean islands' characteristic cooking D. most of the plant species in the Caribbean islands originated is South America E. many of the species of birds that are found in the Caribbean islands spend only the winter there