Final answer:
A bell curve is achieved through norming, which adjusts scores to fit a normal distribution, and is influenced by the size of the sample, which reduces variability and improves representation of the population.
Step-by-step explanation:
The key to generating a bell curve is option B, norming. Norming involves adjusting scores on assessments so they can be compared on a standard scale, which is typically a normal distribution or bell curve. The large sample size is also related, as it helps to achieve the normal distribution that a bell curve represents. This makes the results statistically representative of the larger population. Therefore, a large sample size is important because it reduces sampling variability, leading to a more accurate depiction of the population's characteristics.