08. Answer: Variance and Preferred Gaussian

Variance

The variance is a measure of Gaussian spread; the smallest spread is Gaussian B, the largest is Gaussian A. You may also notice that larger variances correspond to shorter Gaussians.

Variance is also a measure of certainty; if you are trying to find something like the location of a car with the most certainty, you'll want a Gaussian whose mean is the location of the car and with the smallest uncertainty/spread. As seen in the answer, below.