Assertion (A) : Explosive type of volcan...

Assertion (A) : Explosive type of volcanic eruptions are associated with the destructive or convergent plate boundaries in which the heavier plate is subducted beneath the lighter pate.
Reason (R): Materials of the upper mantle lying below the mid-oceanic ridges are melted and move upward in the form of lava during volcanic eruptions.

Both A and R are true and R is the correct explanation of A

Both A and R are true but R is not a correct explanation of A

A is true but R is false

A is false but R is true

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