What was asserted that the united states had the right to intervene in the affairs of neighboring american countries?

To preclude European intervention, in December the Roosevelt Corollary asserted a right of the United States to intervene in order to "stabilize" the economic affairs of small states in the Caribbean and Central America if they were unable to pay their international debts.

https://en.wikipedia.org/wiki/Roosevelt_Corollary

I hope this helped :)

i would say b. or c.