A
There are two (2) apparent features that show that the boundary at label D is a convergent boundary. These features are the trench and the subducting plate
Explanation:
In a convergent boundary, two plates moving in opposing direction collide. The denser plate, usually the oceanic plate, gets subducted underneath the less dense plate usually the continental plate. Due to the enormous stress of the subduction, the plates usually warp downwards at the boundary hence the formation of a oceanic trench.
Another common feature of convergent boundaries is a volcanic arc which is a chain of volcanic mountains. These are formed because of the fissures that develop along the boundary due to the stress between the two plates. The subducted plate, as it dives into the mantle, melts and the magma rises through the fissures. At the surface the magma erupt into a volcanic mountain. Due to the numerous fissures along the boundary, several mountains (a mountain chain) will develop.
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