What event in 1927 was a main reason that the U.S. Army Corps of Engineers implemented many projects in the following years to better protect people and property in the Mississippi delta?
A. an unforeseen dramatic increase in the number of migrating birds passing through Louisiana
B. a major that affected the entire lower Mississippi River valley
C. major hurricane that destroyed most of the buildings in New Orleans and the surrounding areas
D. major oil spill in the Gulf of Mexico areas