This poster targets at people who travel or want to travel because it is an attempt to praise the work of Union Pacific Railroad as a way to advertise the company. The audience of this advertisement would more likely be the possible consumers of this kind of service, in other words, the people who are interested in travelling by train either because they already use it or because they are thinking about starting using it.
B is the correct answer because A makes the reader believe that the two Notaries preferred ether of the options rather than specifying they each chose only one type.
