Final answer:
The best application of a model to solve a problem is a computer simulation of planetary positions to choose the best time to launch a robotic lander to Mars.
Step-by-step explanation:
The best application of a model to solve a problem would be d) A computer simulation of planetary positions to choose the best times to launch a robotic lander to Mars. Computer simulations are ideal for studying complex systems as they can simulate and visualize the interactions and relationships within the system. In this case, the simulation model can accurately predict the planetary positions and determine the optimal launch window for a robotic lander to Mars.