Option 1: This option states that the magnetism of a bar magnet can be destroyed if it is kept in the magnetic meridian and heated to the Curie temperature. The magnetic meridian is the line passing through the geographic north and south poles, and placing a bar magnet in this position does not affect its magnetism. However, heating the magnet to the Curie temperature can indeed destroy its magnetism. Therefore, option 1 is incorrect.

Option 2: This option states that the magnetism of a bar magnet can be destroyed if it is placed in a direction opposite to that of the Earth`s horizontal intensity. This is true because the Earth`s magnetic field aligns with the north and south poles. By placing the bar magnet in the opposite direction, the magnetic forces cancel out, resulting in the destruction of magnetism. Therefore, option 2 is correct.

Option 3: This option states that the magnetism of a bar magnet can be destroyed if it is placed in a direction opposite to that of the Earth`s horizontal intensity and heated to the Curie temperature. As discussed before, placing the bar magnet in the opposite direction can destroy its magnetism, but heating it to the Curie temperature is also required. Therefore, option 3 is incorrect.