In What Respect Were Ethiopia's and Siam's (Thailand)encounters with European

In what respect were Ethiopia's and Siam's (Thailand) encounters with European imperialism in the long nineteenth century similar?

A) Both avoided the colonization to which their neighbors succumbed.
B) Both negotiated agreements to guarantee their independence.
C) Both became settler colonies of the Latin American countries.
D) Both became politically independent "neo-European" societies.