Given that all of the choices are true, which one would most effectively introduce the subject of this paragraph?
F. NO CHANGE
G. Obtaining a portable forge for the shop proved to be Lee’s biggest challenge.
H. Blacksmith shops can be difficult to construct, but the most challenging task is moving the necessary equipment into it.
J. A blacksmith’s forge requires some type of blower in order to keep the fire hot enough to bend the steel.