The area along the Ohio River is well-known for its ________ ind

The area along the Ohio River is well-known for its ________ industry.

A.Roundheads
B.creditor
C.Sinn Fein
D.inner-city areas
E.Omaha
F.steel
G.the Outback
H.Mount Logan
I.The Whigs
J.bishops
K.regionalism
L."clean air zones”
【正确答案】：F