MOUNT PINATUBO, (WHICH/ WHO/ WHOM/ WHOSE) IS A VOLCANO IN THE PHIL...
2. Mount Pinatubo, (which/ who/ whom/ whose) is a volcano in the Philipines erupted in 1991.
2. Mount Pinatubo, (which/ who/ whom/ whose) is a volcano in the Philipines erupted in 1991.