a. It is biased because it reflects an attitude about one of Thomas Young's ideas.
Explanation:
The given excerpt from "The Riddle of the Rosetta Stone" by James Giblin which became the inception for the study of ancient Egyptian history. In his book, Giblin projects the ideas and opinions of Thomas Young in his attempts to decipher the stone's hieroglyphics. Although Giblin believes Young may have contributed valuable information regarding the stone writings, he also believes that Young's ideas are sometimes biased.
Like for instance, in the given excerpt in the question, he mentions one such ideas of Young where he "<em>made a leap of the imagination"</em>. In cases such as this, it is important to find or provide actual proof, rather than depend on <em>"inspired hunches"</em>. Thus, this passage is a biased one as it reflects one of Young's attitudes.
