Answer:
c. producing up to 800ft of structural element in one pass
Step-by-step 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.