Answer:
B). Secondary.
Step-by-step explanation:
The authors or speakers employ a variety of information form a wide range of sources that not only assists in improving the contextual depth and meaning of their work but also establish the credibility of their claim. These sources could be primary, secondary, or it could be tertiary as well.
Secondary sources are elucidated as the document that primarily informs the readers about the information provided in the primary sources and for which it is also regarded as the second-hand sources. These may include magazines, journals, biographies, etc.
As per the given description, the kind of book review that Alice has discovered would be a 'secondary source' as it has 'condensed and understandable version' of the review mirrors the observational and analytical characteristics of secondary sources that are primarily done for providing the readers with a more compact form of the information given in primary sources. Therefore, option B is the correct answer.