Final answer:
The ball-and-stick model is the best option for determining bond angle and bond length, as it clearly represents these aspects in three dimensions.
Therefore, option C is correct
Step-by-step explanation:
The best model to use when trying to determine bond angle and bond length for a specific molecule is the ball-and-stick model. This model represents atoms as balls and the bonds between them as sticks, which helps visualize the angles and distances in three dimensions. While the space-filling model shows the relative sizes of atoms, it does not clearly represent bond lengths and angles, as atoms can obscure each other. Structural models can provide information on how atoms are connected, but do not typically convey accurate angles or distances. Therefore, using all models together may not be necessary or the most efficient choice for determining bond lengths and angles specifically.