Concept:The Sunda Trench is a deep oceanic trench formed by tectonic plate subduction, and it lies in the Indian Ocean.Explanation:Oceanic trenches are the deepest parts of the ocean floor. They have steep sides and narrow basins. The Sunda Trench, also known as the Java Trench, is located in the Indian Ocean near Sumatra. It is created where the Australian-Capricorn plates slide under the Eurasian Plate. This trench is 3,200 km long and reaches a maximum depth of 7,290 metres. That depth is the deepest point in the entire Indian Ocean. Active volcanoes and strong earthquakes often occur along such trenches. Therefore, the Sunda Trench is found only in the Indian Ocean.Answer:Option A: Indian Ocean