GRE Text Completion: Manhatton-GRE填空Manhatton - E867M6H5Y3REJOXT=

Exactly which bird species fell victim first to the deadly virus is the subject of ongoing controversy; what is known, however, is that it took but a slight mutation in the pathogen's genetic constitution to render it lethal to ____________ of related species. A. a contraband B. a surplus C. an aurora D. a myriad E. a pantheon F. a plethora