The correct option is C.
In the excerpt given above, the author describe a book as a mean of passage which one can use to go to any place in the world and it is described as the cheapest mean of travelling. What the author is saying in essence is that, through reading of books, one can liberate one's mind and soul [that is freedom] and one can enjoy reading and getting experience about so many thing [that is adventure].
In English literature a connotative meaning refers to a commonly understood cultural association that some word carries in addition to its literal meaning. For instance, reading books is associated with enlightment.