Organization structure can be thought of in terms of three dimensions:

Thank you for your invite. My answer is " C ".

   A)    decentralization.  ^^^^^^^^^^^^

(A)                   Thank You. 

vertical coordination, horizontal coordination, integrating mechanisms is the best option.

   A)    decentralization. ......................................................................

I am not clear about the option:

I guess

Vertical coordination, aimed at linking activities at higher levels and lower average levels for the achievement of company objectives.

Horizontal coordination is intended to harmonize activities in hierarchical levels similar or close, but belonging to different departments.

Integrating Mechanism is an entity that allows people and functions to interact freely by transcending boundaries.

I Will Go With Option " A " Vertical, horizontal & integrating

I think, its A)    vertical coordination, horizontal coordination, integrating mechanisms