All his years of painstaking and often frustrating attempts at deciphering had been rewarded. "I am going to do it," he had said as a boy when the mathematician Fourier showed him a copy of the Rosetta Stone. Now he had succeeded. Based on details in the excerpt, the reader can conclude that Champollion mostly felt about his accomplishment

a sense of pride.
thankful to Fourier.
envious of Fourier.
a sense of frustration.