Read the following context and choose the best option to answer the question.
Context: From Today in Science History : Anna Botsford Comstock ( Died 24 Aug 1930 ; born 1 Sep 1854 ) . ( nee Anna Botsford ) American illustrator , writer , and educator remembered for her work in nature study . Pliny the Elder ( Died 24 Aug 79 A.D. ; born 23 A.D. ) . Roman savant and author of the celebrated Natural History , in 37 volumes an encyclopaedic work of very uneven accuracy that was nonetheless an authority on scientific matters up to the Middle Ages . He prepared this as a digest of two thousand ancient books written by nearly five hundred writers .
Question: What does the speaker mean when they refer to the book as having ' uneven accuracy ' ?
Options: 
A. The book is n't always consistent with how accurate it is
B. None of the above choices .
C. Some parts of the book have not been preserved as well and have been damaged
D. Some parts of the book are easier to read than others due to the dense language


A