[单选题]
A certain amount of a monatomic gas is maintained at constant vole 3cv.1r,sb/c ndrl v49 gr4lhodfs +9ume as it fnajfhgtul3)u r 4*4 8is cooled by 50 K. This feat is accomplished by removing 4004gr 3 h*f t)ujn8luf4a J of energy from the gas. How much work is done by the gas?