Answer:
The answer is: Assertive
Explanation:
An assertive type of argument speaks calmly in expressing its aim. It also responds in equal manner.
When Dr. King landed in Birmingham jail due to his protests (together with other people) against the treatment of the black people in Birmingham, he wrote a letter which addressed his concerns. The letter expressed his feelings in a respectful manner. In order not to place blame, his letter used the pronoun, "I" and it was also written in the most relaxed way.
Thus, we can say that his letter showed an assertive type of argument.
