Step-by-step explanation:
The explosive eruption that was enhanced by seawater flooding the magma chamber is option D, Krakatau, Indonesia, 1883.
During the 1883 eruption of Krakatau, seawater flooded into the magma chamber through a crack in the volcano's base. The seawater rapidly heated up and caused a violent steam explosion, which then triggered a massive eruption that blew the volcano apart. This eruption was one of the most powerful in recorded history, with devastating effects felt throughout the region.