Explanation:

- Madagascar is located in the Indian Ocean.

- It lies off the southeastern coast of Africa.

- Option 1: Pacific Ocean is incorrect, as it is the largest ocean but located far from Madagascar.

- Option 2: Atlantic Ocean is incorrect, as it borders Africa's west side, not southeast where Madagascar is.

- Option 3: Indian Ocean is correct. Madagascar is within this ocean, which is on Africa’s eastern side.

- Option 4: Arctic Ocean is incorrect, as it is located near the North Pole, far from Madagascar.

Your highlighted option was:

- Option 3: Indian Ocean