Answer: option C
Explanation:
An open system has limited number of interactions, A+B = C is an example of an open system. It has just a simple process to carry out. But a closed system is represented as ((A+B)-(C-D^3))^4. It is evident that the second example above is complex because of the number of interactions, that is an example of closed system.
So therefore , an open system has simple interactions compared closed system that is complex.