Which Statement About Genetically Modified Organisms Is True

Which statement about genetically modified organisms is true?

A) The proteins made in genetically modified organisms are produced in small quantities so that they do not interfere with normal cell function.
B) The DNA in spiders uses the same genetic code as yeast use,but human cells use a different code.
C) Genetically modified organisms have only been used for small-scale protein production in clinical trials.
D) Scientists can produce more complex proteins made by eukaryotes by genetically modifying eukaryotic cells instead of prokaryotic cells.
E) Humans are eukaryotes and yeasts are prokaryotes,so yeasts cannot be used to produce human proteins.