 Of the following options, which seems to be Tremaine's biggest asset in his investigation?
In his room at the Elsby Commercial Hotel, Tremaine opened his luggage and took out a small tool kit, used a screwdriver to remove the bottom cover plate from the telephone. Tremaine covered the discovery of the powerful unidentified interference on the high-security hyperwave band, the discovery that each transmission produced not one but a pattern of "fixes" on the point of origin. It showed a set of concentric circles, overlapped by a similar group of rings. "The point is this, Jess: we think we've got it narrowed down to this section. "Mr. Bram," repeated Tremaine.
 His history with the town. Folks knew him and were more willing to help him like Miss Carroll, and he knew how to motivate people, like he did by bribing the record keeper for help.
 His history with the town. Folks knew him and were more willing to help him like Miss Carroll, and he knew how to motivate people, like he did by bribing the record keeper for help.  His good looks. They help him flirt with women like Miss Carroll and the librarian, so he could get more information.  His strength. He was able to bust down the door at Mr. Bram's home and catch him in the act of transmitting data.  His ruthlessness. He was strict enough to draw boundaries with the state police that helped his investigation significantly.