Champollion’s brother also had an interest in ancient Egypt is what readers can infer.
Step-by-step explanation:
This excerpt present that Champollion's contribution in the world's knowledge of ancient Egypt did not finish with his death as his brother Jacques-Joseph used his notes and writing to give the Ancient Egypt knowledge and information by completing Egyptian Grammar and Egyptian Dictionary Champollion started.
He did this because of his interest in the same field. His additional work proved that what his brother write was meaning and important to the people. Thus option B is correct.