Which of the following materials is most likely to contain asbestos?

Cement sheets are most likely to contain asbestos because asbestos was commonly mixed with cement to enhance its strength and fire resistance, especially in construction materials from the mid-1900s. This combination made the product durable and suitable for various applications, such as roofing and siding.

In contrast, wood paneling, while it can have certain materials treated with asbestos, typically does not contain it. Brick walls do not contain asbestos since they are made from clay or shale and cured by firing, with no asbestos involved in their composition. Fiberglass insulation is designed primarily from silica fibers and does not include asbestos, especially since it has largely replaced asbestos insulation in many applications following health concerns.

Understanding the historical context and usage patterns of these materials is crucial for identifying where asbestos might still be present in older buildings. Cement sheets, due to their prevalent use and association with asbestos in the past, are considered the most likely option among those listed.