This section contains questions each with two columns I and II. 
Match the items given in column I with that in the column II.

COLUMN - I		COLUMN - II
a.	mixed oxide	i.	Metallic hydride
b.	Non-stoichiometric compound	ii.	Magnetite
c.	Covalent hydride	iii.	Hydrolith
d.	Salt-like hydride	iv.	Hydrogen compounds of  non-metals

• A

  a$\to$i; b$\to$ii; c$\to$iii; d$\to$iv

• B

  a$\to$ii; b$\to$i; c$\to$iv; d$\to$iii

• C

  a$\to$ii; b$\to$iiii; c$\to$iv; d$\to$i

• D

  a$\to$iv; b$\to$iii; c$\to$ii; d$\to$i