The correct answer is option 1, Pacific Plate.

Option 1, Pacific Plate, is considered a major plate in plate tectonics. The Pacific Plate is the largest of all the tectonic plates and covers a significant portion of the Earth`s surface. It is surrounded by several smaller plates and is involved in several important tectonic interactions.

Option 2, Cocos Plate, is a smaller tectonic plate located off the western coast of Central America. While it is significant in terms of its role in the subduction zone, it is not classified as a major plate.

Option 3, Arabian Plate, is another medium-sized plate located in the Middle East. It is involved in the collision between the Arabian and Eurasian plates and has a significant impact on the geology of the region. However, it is not considered a major plate.

Option 4, Philippine Plate, is a smaller tectonic plate situated in the western Pacific Ocean. It is bounded by several other plates and plays a role in the complex tectonic activity in the region. While it is important in terms of its geological processes, it is not classified as a major plate.

Therefore, the correct answer is Pacific Plate (option 1) as it is the