I'd say either railroads or wagon trains because airplanes and steamboats are not land travel and wagon trains are a vehicle and railroads are a thing they ride on to guide them
I believe answer is: Praise
Preys mean something or someone that being hunted by others, praize does not have specific meaning, while prays refers to the act of communicating with a certain type of diety.
Praise means the act of expressing admiration toward a certain things, which is the most suitable for the sentence above.
