Rumors are everywhere, spreading fear, damaging reputations, and turning calm situations into ones.

A．All available iron was needed for other purposes.
B．Iron was considered too valuable for use in public buildings.
C．Limited mining capability made iron too expensive.
D．The use of charcoal for refining ore produced poor quality iron.

A．further improvements in iron processing methods
B．the gradual inclusion of exposed iron in traditional styles of architecture
C．the return to traditional building materials for use in commercial structures
D．the decreased use of stone and timber as a building material