On dipping a loop of platinum wire in borax paste and heating the wire subsequently in hot oxidising flame, produces a colourless, transparent glass-like bead. The bead contains :

On dipping a loop of platinum wire in borax paste and heating the wire subsequently in hot oxidizing flame, produces a colorless, transparent glass-like bead. This bead contains ${\mathrm{NaBO}}_2$ and ${\mathrm{B}}_2{\mathrm{O}}_3$.

A colorless, clear glass-like bead is created by immersing a platinum wire loop in a paste of borax and then heating the wire in a high oxidizing flame. Both sodium metaborate and boron oxide are present in the bead.

Hence, options B and C are correct.