Since Ellsworth Mountains
, Lake Vostok and Ross Ice Shelf are geographical landmarks of Antarctica, the correct option is Torres Strait. That is the only option which is not one of the principal geographical landmarks of Antarctica.
The Torres Strait is a strait located between Australia and the Melanesian island of New Guinea. It is approximately 150 km (93 mi) wide at its narrowest extent. To the south is Cape York Peninsula, the northernmost extremity of the Australian mainland.