Read the text and answer question.
Human's Best Friend
We know that dogs are human's best friends. They love us and we love them. However, we're not so sure where they came from. Many scientists think they came from wolves 15,000 years ago. Although wolves are wild and dogs are tame, they're still a lot alike. Both wag their tails when happy and put their tails between their legs when scared.
Dogs are easy to educate. Well-educated dogs are sometimes used as watchdogs. A watchdog can stop a creature that is five to six times bigger. It is interesting, though, that these dogs, which can become terrifyingly wild in times of danger, pose no harm to their owners. In the face of a threat, they put their lives in danger to save their owners.
(Adapted from http://www.grammarbank.com)
Choose the correct alternative to have the passive voice from the sentence, in bold type, in the text.
Their lives in danger to save their owners.
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