what kind of clause is who help to raise awareness of significant world issues, and does it need commas.

Im giving away free 20 points plus brainliest if answered correctly search and rescue dogs read the following excerpt: 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 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. eventually, the toy is removed from this game, and the dog focuses on the human scent. later the dog will learn more difficult tasks: to pick up a scent from an article of clothing or pick out a particular human scent in a crowd of people, for example. step-by-step, focusing on play-based learning, the dog acquires the techniques needed to find victims. once the dog learns to find the human without the toy, the trainer will continue working with the dog, hiding the "victim" in more challenging spots, making the trail double back on itself, leaving a trail over a wide range of terrains, or adding another person as a distraction. read this line from the text again: later the dog will learn more difficult tasks: to pick up a scent from an article of clothing or pick out a particular human scent in a crowd of people, for example. which of the following is likely a strategy used to teach sar dogs these more difficult tasks? a. playing focused games, such as finding a toy containing a treat b. learning games, few of which relate to search and rescue c. repeating drills like sitting, heeling, and staying d. watching other dogs, mainly to give the trainee some rest