Based on details in the excerpt, the reader can conclude or infer that Champollion mostly felt about his accomplishment "thankful to Fourier." (Option B)
An inference refers to the conclusion that is reached when the facts of a text have been rationally analyzed.
Hence, going by the above, it is proper to that the reaction of the Champollion was mostly that of gratitude to Fourier. He is thankful to Mathematician Fourier because Fourier the way to achieve his dreams.
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