Suppose iron ore is an input in producing steel. how will a decrease in the price of iron ore affect the market for steel

Direct relation. If iron is used to make steel, and iron is cheaper now, steel will also be cheaper. Decrease in price can mean they have a bunch of it, a surplus.
Supply and demand says if you got a lot of something prices go down. So if you have a lot of cheap iron, you can make a lot of cheap steel

What’s the options huh

There are three key entities in thefederal reserve system: the  board  of governors, the  federal reserve banks(reserve banks), and the  federal  open market committee (fomc). while the  federal reserve  has frequent communication with executive branch and congressional officials, its decisions are made independently.