The stability of carbocations
`underset(I)underset()((CH_(3))_(3)C^(oplus))" "underset(II)underset()((CH_(3))_(2)overset(oplus)C(OCH_(3)))" "underset(III)underset()(CH_(3)CH_(2)CH_(2)overset(oplus)CH_(2))" "underset(IV)underset()(CH_(3)overset(oplus)CHCH_(2)CH_(3))`
follows the order
A. `IIIltIVltIIltI`
B. `IIIltIVltIIltI`
C. ` IVltIIIltIIltI`
D. `IVltIIIltIltII`