What anatomy is labeled as letter B in the image below? 
Definitions:
Water Park
A recreational facility that features water play areas, such as swimming pools, water slides, and splash pads.
P-value
The probability of observing a test statistic at least as extreme as the one observed, under the assumption that the null hypothesis is true.
Sampling Variation
The variability in statistics and results that occurs by chance when only a subset of the population is sampled.
Body Mass Index
A numerical value calculated from a person's weight and height, used to assess whether they are underweight, normal weight, overweight, or obese.
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