One Unit of Maruna's Currency (Druba)was Defined as Equivalent to 16

One unit of Maruna's currency (druba) was defined as equivalent to 16 grains of "fine" (pure) gold,while one unit of its neighbor,Rashumba's currency (troon) was defined as equivalent to 24 grains of "fine" (pure) gold.Using the gold par value concept (with 480 grains in an ounce) ,the exchange rate for converting the druba to the troon is

A) 1.5 troon = 1 druba.
B) 1 troon = 1 druba.
C) 3 troons = 2 drubas.
D) 1 troon = 1.5 druba.
E) 2 troons = 1 druba.