I think I should give the reason for my being in Birmingham, since you have been influenced by the argument of “outsiders coming in.” . . . Several months ago our local affiliate here in Birmingham invited us to be on call to engage in a nonviolent direct action program if such were deemed necessary. We readily consented and when the hour came we lived up to our promises. So I am here, along with several members of my staff, because we were invited here. I am here because I have basic organizational ties here. –“Letter from Birmingham Jail,”
Martin Luther King Jr.

According to the letter, why was King in Birmingham?

He had decided on his own to run a protest.
He had been asked to help stage a protest.
He had lived in that city earlier in his life.
He was a member of that community.

He had been asked to help stage a protest.

Explanation:

According to the excerpt from “Letter from Birmingham Jail,” by Martin Luther King Jr, he talks about clearing the air about why he was in Birmingham, and said he was invited by their "local affiliate" in Birmingham who asked that he should be in the city in case a non violent protest was needed.

Therefore, according to the letter, King was in Birmingham because he had been asked to help stage a protest.

c]extended voting rights to african americans

depends on the age of the teen, many believe by the age of 16 a person should know the strong difference between right and wrong along with the difference between risky and immediate death. swimming with sharks might be dangerous but swimming with sharks while bloody meat is attached to you is just insane. even more if you have no idea what you're doing. however, no matter the age, as long as the person is skilled enough and has the mental and physical capacity to control their actions doing whatever sport they put their mind to is all that matters.