The correct answer is option 1: Pacific Ocean. The Melanesian Island Group is located in the Pacific Ocean. Melanesia is one of the three main geographical regions in the Pacific Islands, along with Micronesia and Polynesia. It is situated to the northeast of Australia and includes countries such as Papua New Guinea, Fiji, Vanuatu, and the Solomon Islands. Melanesia is known for its rich cultural diversity, with a wide range of indigenous languages, traditions, and customs. The Pacific Ocean is the largest and deepest ocean in the world, covering more than 60 million square miles and containing numerous islands and archipelagos. It is important to note that the Atlantic Ocean, Indian Ocean, and Arctic Ocean are not correct options for the location of the Melanesian Island Group.