Which pantry materials can dermestid beetles attack and destroy?

Dermestid beetles are known to be pests that target a variety of pantry materials. The correct choice highlights their ability to infest and feed on both grain and flour, which provides them with a rich source of carbohydrates necessary for their development. In addition to these food items, dermestid beetles also attack organic materials such as woolens and furs.

Woolens provide proteins and other nutrients that are essential for the beetles' lifecycle, making these textiles a viable target for their feeding habits. This is a critical aspect of understanding dermestid beetle behavior, as pest management strategies must take into account both food sources and non-food organic materials they may infest.

In contrast, the other options are too restrictive or specific in terms of what these beetles can damage, leading to an incomplete understanding of the potential impact of dermestid beetles on both food and materials stored in pantries or storage areas. It's important to recognize the broader range of materials they can infest, which is why the selected answer encompasses the true extent of the dermestid beetles' destructive capabilities.