Final answer:
The correct statement about tornadoes in Oklahoma is that the state averages more than 100 tornadoes per year, which is characteristic of an area in Tornado Alley.
Step-by-step explanation:
The true statement about tornadoes in Oklahoma is that Oklahoma averages more than 100 tornadoes per year. Each year, this state, which is located in the region known as Tornado Alley, experiences a high frequency of tornadoes due to its geographical and meteorological conditions. While the deadliest tornado in history did not occur in 1999, and tornado frequency varies across counties, it is likewise not accurate to say that tornado severity is worse in the summer months than in the spring, as May historically sees the highest number of tornadoes. Spring is typically considered the peak of tornado season in Oklahoma.