In Chapter $13$ in the book by Jack Davis, you learned how Harrison County, MS$,$ home to Gulfport and Biloxi, saw massive growth in its coastal population after being devastated by hurricane Camille in $1969.$ What was the main reason for the coastal growth?

a$.$ The legalization of casino gambling, which legally required casinos to float on water, making the coast an attractive place to build.

b$.$ The city used money earmarked for recovery to build a seventeen$-$foot$-$high$-$by$-$twenty$-$seven$-$foot$-$deep seawall of granite boulder to protect the city's inhabitants from future storms.

c$.$ Nash Roberts relocated full$-$tithe to Biloxi to provide his weather forecasting expertise to inform the city's inhabitants about the path and strength of future storms.

d$.$ The city raised itself on average eleven feet by pumping in fill sediment from the surrounding bay to inspire confidence in future developers.