The correct answer is - D. It contains a usable amount of aluminium.
The bauxite is a type ore that is very demanded on the global market, and this is for the sole reason that it is the ore that contains aluminium. Almost all of the aluminium that has ever been extracted and used from the humans has been from bauxite ore.
It is a sedimentary rock, and it consists mostly of aluminium and iron-oxides. The biggest reserves in the world of this ore are located in Guinea, Australia, Vietnam, Brazil, and Jamaica.