A concern with historic preservation in the United States can be traced to
a. the late 18th century, when societies were formed to ensure the protection of historically significant properties.
b. the early 20th century, when industrial development began to threaten significant sites.
c. the 1960s and 1970s, coincident with more broadly based environmental preservation movements.
d. the overwhelming attitude in the United States is, and has always been, a lack of concern for historic preservation
e. development, which is allowed to run rampant no matter what the cost.