There should really be an option D: Nonexistent.
But, if I HAD to choose, I suppose...C.
Answer:
This might be of some use:
Explanation: Immediately after reports of the second attack, Johnson asked the U.S. Congress for permission to defend U.S. forces in Southeast Asia. ... The Gulf of Tonkin incident and the subsequent Gulf of Tonkin resolution provided the justification for further U.S. escalation of the conflict in Vietnam.
Explanation:
The crusades were about the Christians wanting to take back the holy land from the Muslims.
The purpose was justifying breaking away from britian and explaining the reasons for becoming independent
It diverted from north amreica