Answer:
B
Explanation:
Jargon is the technical words and phrases used particularly by a specific profession or group of people. For example, medical, legal jargon. The quotation “Marlow sat cross-legged right aft, leaning against the mizzen-mast” contains the terminology mizzen-mast, which is a nautical word (related to sailing and ships). Mizzen means the mast aft (pole) of the main mast in a ship.