20. Passage A quotes Vavilov as saying “‘I could see with my own eyes that I had stumbled upon the centre of origin for the apple’” (lines 11–12). In Passage B this quote is directly:
A. invoked by the passage author as he imagines what Kazakhstan looked like centuries ago.
B. used to support an argument by USDA scientists.
C. paraphrased by Salova.
D. refuted by Bussey.