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Only two of the following four sentences are correct; please indicate below ( a), b), c), d) ), which pair of sentences is correct: 1- Although gorillas appear being dangerous, they are peaceful animals.
2- Male gorillas dislike meeting other males, but will avoid to fight them if they can.
3- A famous zoologist, Diane Fossey, managed to live with gorillas for 18 years.
4- The Diane Fossey Gorilla Foundation aims to protect mountain gorillas.