He shares that it will be dangerous, but he is attracted to the mystery of it all. Thus, option "B" is correct.
Going through the text, the writer's excitement is communicated with words like "trembling sensation". He is excited about the journey he is about to take but he is also aware of the dangers, therefore cautious.
So as he writes, he takes care not to expect much success. He also anticipates that he may not return, hence the line "should you never hear from me again".
He is clearly excited about his journey but cautious about the dangers and cautious enough not to ignite hope about his return to whoever he is writing to.
Thus, option "B" is correct.
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