The correct order of reactivity of PhMgBr with
`underset((I))(Ph-underset(C)overset(O)overset(||)(C)-Ph)" " underset((II))(CH_(3)-overset(O)overset(||)(C)-H)" " underset((III))(CH_(3)-overset(O)overset(||)(C)-CH_(3))` is
A. I gt II gt III
B. III gt II gt I
C. II gt III gt I
D. I gt III gt II.