The correct answer is: C. Either I or II is implicit.
The statement “Read this book to get detailed and most comprehensive information on this issue” implies that the book is a good source of information on the issue. However, it does not say anything about whether or not there are other books available on the issue. Therefore, either assumption I or assumption II could be true.
Assumption I is that the person who wants this information can read. This assumption is necessary because if the person cannot read, they will not be able to get the information from the book.
Assumption II is that there are other books available on this issue. This assumption is not necessary because even if there are other books available, the book being recommended may still be the best source of information.
Therefore, either assumption I or assumption II could be true.