2.Manufacturers rate batteries in watt-hours; if they rate the watt-hour higher, the longer the battery can be expected to last.
(A) if they rate the watt-hour higher, the longer
(B) rating the watt-hour higher, it is that much longer
(C) the higher the watt-hour rating, the longer
(D) the higher the watt-hour rating, it is that much longer that
(E) when the watt-hour rating is higher, the longer it is