To my mind, the answer ( B ) is the inappropriate sentence. In a formal writing informal tone must be avoided as well as colloquial expressions.
As the title suggests, a treasure, but more specifically alluded in the plot, it's the pirates'treasure . However, a treasure is always the symbol to depict the immorality of that age when Stevenson wrote this novel of adventures.
This is Macbeth right?
if so then the Scottish Forces
option C
