When convergent boundaries interact, the formation of island chains happens. The correct option is A.
Convergent boundaries is the name given to those plates which collide with one other, and they may both go upside or one plate from beneath the other plate.
Convergent boundaries collide in three forms and for different types of landforms. The types are:
When convergent boundaries interact, they create a chain of islands. When one plate moves over another, a hot plate erupts lava and forms volcanic eruptions.
Thus, the correct option is A. formation of island chains regarding when convergent boundaries interact.
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