Which of the following do silverfish and firebrats feed on?

Silverfish and firebrats are known to feed on a variety of organic materials, particularly those that contain starch or sugar, which are found in items such as glue, wallpaper paste, and paper. They thrive in environments where these materials are present, making them common pests in areas like kitchens and basements where food remnants and products like wallpaper may be found. Their diet primarily consists of carbohydrates, which they derive from such materials, allowing them to survive and proliferate.

While they may occasionally consume other organic substances, their preference for glue and paste is a defining characteristic of their feeding habits. The other options, such as wood, food scraps, and oil and grease, are not as representative of their primary diet. Therefore, the correct choice accurately reflects the typical feeding behavior of silverfish and firebrats.