Which of the following two items do not go together? a. asiento - ocupado c. horario - vía b. revisor - boleto d. sencillo - ida y vuelta

Explanation:

Let's see every answer choice. All those words can be used when you travel by train.

a. Asiento - ocupado

Asiento is seat, and ocupado means taken. Then asiento - ocupado may perfectly go together in a sentence: el asiento está ocupado means the seat is taken.

b. Revisor - boleto

Boleto is ticket and revisor is the person who checks the ticket (in British that may be named inspector), then those two words go together in a sentence.

c.  Horario - vía

Horario means schedule and vía means the railway, then those two items are not related as the other pairs are.

d. Sencillo - ida y vuelta.

Sencillo is referred to a single or one way ticket and ida y vuelta means a roud trip or two way ticket. Quisiera un boleto sencillo o de ida y vuelta? means Do you like an single or a round trip ticket?