Search and Rescue Dogs Read the following excerpt:

Have you ever seen footage of search and rescue dogs working at disasters? Have you seen movies or TV programs in which dogs are used to find lost children or track escaped prisoners? Search and rescue dogs save many lives, but they also inspire respect and admiration. They go where we can't go, use senses that out-perform our own feeble versions, and they save lives with the help of their expert trainers and handlers.

Search and rescue dogs (SARs) are not just born, however. They require a huge investment of time, dedication, training, and patience almost from the day they are born. SAR dogs are carefully selected when they are quite young. Trainers look for dogs that lack aggression and respond well to commands.

If a dog is selected for SAR training, it will be taught—through a series of games—how to make the most of its powerful nose. For example, dogs learning to follow scents on the air might play a tug-of-war game with the trainer involving a special toy. Then with a helper restraining the dog, the trainer will run away with the toy, find a hiding spot, and then call the dog. The dog can follow the scent of both the trainer and the toy. In this way, the dog is practicing important skills even though it may seem like just a game.

Read this line from the text again:

Search and rescue dogs save many lives, but they also inspire respect and admiration

Which line from the text supports the point made in this sentence?

They require a huge investment of time, dedication, training, and patience.
Trainers look for dogs that lack aggression and respond well to commands.
If a dog is selected for SAR training, it will be taught—through a series of games.
The dog can follow the scent of both the trainer and the toy.