If you live in an area that was flooded by the 100-year flood last year, you can conclude that
a. the next 100-year flood will occur in exactly 100 years.
b. you do not have to worry about another flood of that size during your lifetime.
c. the next 100-year flood will occur in exactly 99 years.
d. there is a 1% chance you could be flooded by the 100-year flood again this year.