Which of these was the primary cause for U.S. military intervention in Colombia in 1903?

Question

Responses
A The United States was fighting the spread of communism.The United States was fighting the spread of communism.
B Colombia rejected the U.S. offer to build a canal through Panama.Colombia rejected the U.S. offer to build a canal through Panama.
C Under a ruthless dictator, Colombia’s military had invaded Panama.Under a ruthless dictator, Colombia’s military had invaded Panama.
D The Colombian province of Panama had formed an alliance with Nicaragua.

Answer 1

B. Colombia rejected the U.S. offer to build a canal through Panama.

The primary cause for U.S. military intervention in Colombia in 1903 was related to the United States' interest in building a canal through Panama. After Colombia rejected the U.S. proposal for the canal, the U.S. supported Panama's independence movement, leading to the establishment of Panama as a separate republic and eventually allowing the U.S. to build the Panama Canal.