What was the cause of flooding in the 1993 upper mississippi river flood? select one: a. heavy snowmelt in canada sent large volumes of water down the river in the spring. b. persistent thunderstorms caused large amounts of rainfall over a several-state region. c. winter produced rain that melted snow that was on the ground. d. a dam failed because it had been built in a risky place near a fault

Persistent thunderstorms caused large amounts of rainfall over a several-state region was the cause of flooding in the 1993 upper Mississippi River flood .

Explanation:

In 1993 , Mississippi and Missouri rivers flooded , also called The Great Flood of 1993 or The Great Mississippi and Missouri Rivers Flood of 1993 .

This was among the most costly  and devastating flood in United States , Destroying around  30,000 square miles , the cause of flood was thunderstorm and heavy rainfall , the wet soil condition was the cause of sever flood in the upper Mississippi River basin .