I think that it’s c, sorry if it’s not
Levees and embankments allow humans to c)settle below river level. A levee is defined as "an elongated naturally occurring ridge or artificially constructed fill or wall, which regulates water levels." This definition can also be used for the term embankment.
B. plate tectonics your welcome
Theres a big radiation cloud that only provides stronger evidence that the big bang theory is correct.
