What does concrete flow testing indicate about the slump of concrete?

The statement that a higher slump indicates that the concrete is more fluid is accurate. Slump tests measure the consistency or workability of fresh concrete. When concrete is poured into a conical mold and then removed, the amount the concrete settles or "slumps" gives an indication of its fluidity. A higher slump measurement means that the concrete has a more fluid consistency, which allows it to flow more easily and fill forms or mold shapes without much resistance.

This test is crucial in determining whether the concrete mix has the appropriate consistency for specific applications, ensuring that it can be placed and finished effectively. A lower slump would actually indicate a stiffer mix that may not flow as easily, while a higher slump suggests a more workable mixture, suitable for various construction tasks.

Considering the context of fluidity and the correlation between slump measurements and concrete consistency clarifies why option B is the best choice.