The United States deploys two types of submarines -- attack submarines and ballistic submarines. Attack submarines carry cruise missiles to attack specific locations on land, and they are also used to spy on foreign countries. Ballistic submarines carry intercontinental ballistic missiles that deliver nuclear missiles at a minimum range of 3, 400 miles. Consequently, there is little advantage to placing a ballistic submarine near the coast of any country. Both submarines are nuclear-powered, but only the ballistic submarines carry nuclear weapons. The United States believes that a foreign country is plotting to attack her homeland, but more intelligence must be collected. The United States plans to deploy a submarine off the coast of the foreign country. Which one of the following would be a reasonable conclusion based on the passage? ['The United States should develop a new type of submarine to gather the evidence.', 'The United States should pre-emptively attack the foreign country to best defend itself.', 'The United States should deploy an attack submarine off the coast of the foreign country.', "The United States should plant an agent in the foreign country's intelligence service."]