Answer:
a. por el Cabo de Hornos
Step-by-step explanation:
Before the panama canal was built the boats had to travel througg south america in order to reach Asia, and the other hemisphere of the earth, the had to travel throu cape Horn in southamerica, or Cabo de Hornos, the construction of the Panama Canal made the travel from Europe to Asia, the Panama Canal made the travel shorter and made it possible to shorten the travel time by 2 months.