Final answer:
Bertrand's argument for protectionism is The National Security Argument, which focuses on ensuring a nation's security by maintaining control over the supply of key products.
Step-by-step explanation:
Bertrand is using The National Security Argument for protectionism. This argument is grounded in the belief that it is risky for a country to rely heavily on imported goods for key products, such as oil, because this can lead to a dependency that might compromise a nation's security if supply is interrupted. Bertrand's preference to drill for oil domestically rather than import it is based on the premise that certain resources are critical for national security, such as powering military tanks and planes.