Jane is observing a cell under an electron microscope she identifies and organelle having an outer and an inner membrane she also notices that the outer membrance is smooth while the inner one is highly folded. which organanelle is jane observing

Well if its the inner one that is folded then its Mitochondria

Jane is observing the mitochondria. The highly folded inner membrane is called the cristae.

The label A corresponds to Convergent boundary zones  

Explanation:  

When two oceanic plates collide, it occurs oceanic convergence. The thicker and older plate subduces under the other plate, and at this point, it starts the volcanic activity. As the thicker plate descends, it is heated and melted and its materials are incorporated into the mantle. The fast subduction originates magma that ascends to the surface by crevices. This makes place to the formation of grouped volcanic islands, the island arches. Subduction zones coincide with deep-sea trenches or depressions in the ocean bed. The volcanic islands are arranged in a circumference arch shape, which is bordered by a fossa. Most of these are located in the western Pacific, where the pacific crust is older and thicker, and hence it submerges easier in the mantle.