This is a test of commonsense with single/multi-choices. Complete the next sentence:

How to take your horse on a long trailer ride
Make sure the trailer is in proper working order.
Check your trailer carefully before completing a long distance trip. Make sure that your trailer is an appropriate size for the horse being transported.

Choices: (i) Check to see if your trailer subject to any problems. The trailer could be too small for your horse that could mean it is too heavy or too small for the horse.. (ii) Look carefully at the trailer dashboard to make sure everything is in working order and you have not missed anything. See if there is a fixed tire change box and make sure you know what to do next.. (iii) If you have more than one horse, make sure that none of them is taller than the other to accommodate them both. Some breeds (like cushing or bravanese) will require large trailers to hold smaller horses.. (iv) For example, a small trailer will be very uncomfortable for a large horse. Inspect the following parts of the trailer before heading out : Tire pressure..
The answer is:
(iv)