Answer:
B). 'A German priest of the 1600s, Athanasius Kircher, wrote the first grammar and vocabulary of Coptic, the language of Christian Egypt.'
Step-by-step explanation:
In the given excerpt from 'The Riddle of the Rosetta Stone,' the central claim of Giblin is the 'notable contributions made by various scholars to add to the world's knowledge of ancient Egypt.' This claim is substantiated through the detail of the 'German priest, Athanasius Kircher, who is accredited for writing the first Coptic grammar and vocabulary.' This detail helps in validating the truth of the assertion logically and persuade the readers to believe in it. Thus, option B is the correct answer.