1. What statement best describes King's purpose in writing the letter? King hoped to explain why the discrimination of A. African Americans is immoral by giving specific examples of its harmful effects
B. King sought to criticize white Americans who were supportive of his cause but who were too fearful of the Klan's terrorism to take action to end racism.
C. King attempts to encourage all Americans to end racism by joining the cause to defend civil rights for African Americans.
D. King sought to respond to the criticism he received from people that he considered to be colleagues by methodically addressing each of their claims.

the present continuous is a verb tense which is mainly used to indicates that an action is in progress at the moment of speaking.  

it is formed using: person + verb to be (am/is/are) +verb + - ing form  

example: i am studying at this moment .

in addition, the present continuous is also used in order to express things that will or will not happen in the near future.

example: i am having dinner with some friends tonight.

the speaker sometimes   uses it   to express that an action is repeated and it causes irritation on the part of the speaker

example: my sister is constantly complaining about everything.

everett ross tried the pasta but liked the soup more