A Meteorologist Is Hoping to Find a Better Model for Predicting

A meteorologist is hoping to find a better model for predicting when and where an avalanche will occur around ski areas in Montana. She plans to collect information from a ski area weather station each day between November 1 through March 31 for each of the next three winters. For each day, the meteorologist will record the high and low tem-perature, amount of snowfall, maximum wind velocity, whether at least half the daylight hours were sunny, and whether an avalanche occurred.
-What are the observational units?

A) Years
B) Ski resorts
C) Days
D) Avalanches