Question

Gina wants to use models to better understand how the types of bonds in a molecule relate to the presence of geometric isomers.

Answer 1

The answer to this question is D! The ball and stick model! Hope this helps :)

Answer 2

Answer is: the ball-and-stick model.

Ball and stick model gives informations about bond lenght and space filling model gives information about space occupied by atoms.  

In chemistry, the ball-and-stick model is a molecular model of a chemical substance which is to display both the three-dimensional position of the atoms and the bonds between them.

The atoms are represented by spheres, connected by rods which represent the bonds. Every ball represent one atom in one molecule and they have different colors for different atoms (for example, carbon is black, hydrogen is white, nitrogen is blue).