The correct option is B False
A) Cassiterite is a tin oxide mineral, SnO2
B) Bauxite ore is Al(OH)3 with possible additional Al and (OH).
C) Cryolite Na3AlF6, (sodium hexafloroaluminate) is an uncommon mineral.
D) Hematite, is the mineral form of iron (III) oxide (Fe2O3), one of several iron oxides.
So Cryolite is the only mineral which is not belongs to oxide ores.
Hence options A,B&D are correct options.