What type of container can be used to obtain the concrete sample for this procedure?

The correct answer is based on the requirement for using containers that do not react with the concrete mix and do not absorb moisture, which could potentially affect the sample's integrity. A metal pan and a wheelbarrow are suitable options as they provide a sturdy, non-reactive surface that can hold the concrete sample without contaminating it. The inclusion of a flat, clean, nonabsorbent mixing board ensures that the sample can be prepared without the risk of absorption or reaction that could occur with other materials.

Choosing this option reflects an understanding of the importance of maintaining the purity and consistency of the sample during collection and handling, ensuring that any testing performed afterward accurately represents the concrete being studied. The focus on nonabsorbent materials is particularly crucial, as absorbent materials could lead to changes in the composition of the concrete sample, resulting in skewed test results.