Final answer:
B. Putty and caulking. The best way to eradicate and create a barrier for roaches through the exclusion method is through the use of putty and caulking.
Step-by-step explanation:
The best way to eradicate and create a barrier for roaches through the exclusion method is through the use of putty and caulking. Roaches can enter buildings through small cracks and crevices, so sealing these entry points with putty and caulking helps to prevent their entry. This method creates a physical barrier that roaches cannot pass through.
Another effective method is using wire mesh. This can be used to cover larger openings such as vents or drains to prevent roaches from entering. The mesh should have small enough gaps to prevent roaches from getting through.
Glue and chicken wire can also be used, but they may not be as effective as putty and caulking or wire mesh.