With the use of three different weights, namely 1 lb., 3 lb., and 9 lb., how many objects of different weights can be weighed, if the objects is to be weighed and the given weights may be placed in either pan of the scale?
<spanclass=′latex−bold′>(A)</span>15<spanclass=′latex−bold′>(B)</span>13<spanclass=′latex−bold′>(C)</span>11<spanclass=′latex−bold′>(D)</span>9<spanclass=′latex−bold′>(E)</span>7