The exchange of e-mail between companies in different states can create personal jurisdiction in a lawsuit when:

The altercation of electronic mail among companies in different states can make personal jurisdiction in a law suit when the electronic mail is an integral part of an continuing business relationship even if no offices or employees are within the forum state. The federal and state courts grappling with how personal jurisdiction applies on the internet have not questioned the minimum contacts framework. Instead, they have devoted time in apologizing internet phenomena including web pages, electronic mail, the use of internet equipment and interactive online activity to real world phenomena, national print or broadcast advertisements, telemarketing and physical distribution of goods. 

B) hypothesis. its guessing and your guess could be changed quickly based on the information.