From where must concrete be removed before lifting the mold?

Removing concrete from the area surrounding the base of the mold before lifting is crucial for ensuring a clean and stable release of the molded shape. This action helps prevent any accidental damage to the mold or the newly formed concrete shape, which could occur if there is concrete still adhering to the sides or base.

When the surrounding area is cleared, it allows for a smooth extraction process and reduces the risk of entrapment or additional friction that might hinder mold removal. This practice is part of proper procedures to ensure efficiency and maintain the integrity of both the mold and the concrete.

Other options, such as focusing on the top of the mold, inside the mold, or the bottom of the slump mold, do not address the primary concern of removing potential obstacles that could affect the lifting process.