Phosphorus forms a variety of oxyacids. In all these, phosphorus is `sp^3` hybridised and is tetrahedrally bonded to four neighbouring atoms. These contain P-OH bonds, the hydrogen of which are ionisable giving acidic character to these compounds. These also contain P-H bonds in which hydrogens are notionisable because P and H have nearly same electronegativity. The presence of P-H group in these oxyacids is responsible for their reducing properties. The structures of some oxyacids are given below :

Answer the following (1 to 7) questions : The oxyacid of P having tetrabasicity is

Options

A. C and H
B. C and E
C. C and D
D. B and E