Casting beds take advantage of factory production environments by: Select one:
a. creating all structural elements upside-down.
b. allowing the use of inferior concrete.
c. producing up to 800 ft of structural elements in one pass.
d. removing the requirement for rebar.
e. providing a movable formwork.

c. producing up to 800ft of structural element in one pass

Explanation:

Casting beds are construction molds put in place to generate or produce structural reinforced concrete components called Pre-cast elements (beams, column and slabs) in-other to be used for the construction of building or bridges.

The length of these mold are as long as a 1000ft in-other to achieve the required component and this takes most of the factory spaces.

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all of them make sense but, i would have to say ask someone who has been there/or lives there, and/or read recent newspapers from that city.

hope this !