I don’t know I just had to answer a question sorry
He had openly stated in one of his letters that he would like to have full control of the Kongo-Portuguese slave trade. However, he was opposed to slavery and actually fought with the Portuguese.
Do you have a picture of the map that i can see?
A. 1967/1968
The other answers weren't even during the time of the Vietnam Conflict, whereas Option A even coincides with protests close to Kent State in 1970.