No it wasn't THE first suspension bridge in america. THE first suspension bridge in america was the wire bridge at fairmount in philadelphia.
The four classes were the following:
gentry and scholars (shi)
peasant farmers (nong)
craftsmen (gong)
shang (merchants)
the top of the hierarchy was occupied by the shi - the gentry.
I got a 100 on this paper and the answer is B and C
The answer is C, preserving the Union. Lincoln famously said, "If I could preserve the Union without freeing a single slave, I would."