The correct answer is A) mountainous.
The word or phrase that best describes the part of Panama where the canal was built is "mountainous."
The result of the negotiations between France and the United States was to allow the US to built the Panama Canal. The name of the Treaty was Hay-Bunau-Varilla. In the 1880s, the government of France had tried to build a canal, but different issues arose such as the mountainous terrain and the extreme heat in tropical weather (including mosquitos), deterred them. The US government started the construction in 1904 and end it in 1914. The canal is a waterway of 48 miles that allows ships to cross from the Pacific Ocean to the Atlantic Ocean and vice versa.
The other options of the question were B) flat. C) cool and dry. D) warm and dry.