What materials can be used to construct RECPs?

The correct choice identifies that materials like coconut and straw can be effectively used to construct rolled erosion control products (RECPs). These natural fibers serve important functions in erosion control by providing ground cover, reducing raindrop impact, and promoting vegetation growth. Coconut fibers, often used in the form of coir mats, are especially effective due to their durability and ability to retain moisture, which can help in establishing plants.

Additionally, straw, often used in straw blankets, offers excellent cover and helps prevent soil erosion while allowing water and air to permeate through. This is crucial in managing sediment and stormwater effectively. These organic materials are biodegradable, making them environmentally friendly options for controlling erosion on construction sites and landscapes.

Other options involve materials like plastic, glass, wood, and metal, which are not suitable for RECP construction. Plastic and glass do not provide the same biological benefits or support plant growth, while wood and metal might not offer the flexibility and erosion control effectiveness that natural fibers do.