The correct answer is C. Significant and Great value.
Explanation
According to the excerpt from "The Riddle of the Rosetta Stone" by James Cross Giblin, we can say that the words which Giblin uses to show his point of view are "Significant" and "Great Value", because they are adjectives, so they are words that highlight or refer to a characteristic of an object, a person or a situation. Therefore, when James Cross says that "Some of these scholars made significant contributions" he gives value to the contributions that scholars made from his point of view. Later when he mentions that "These books were going to be of great value when the hieroglyphs were finally deciphered" he also adds value from his point of view to the books he is talking about because of the above, the correct answer is C. significant and of Great value
