To conclude means to finish or wrap up
Its not a sound its a substitute for the actual meaning its let freedom be heard
The effect of the narrative description of Huck's father is of a man who is not looked after, who is poverty stricken and unkempt and with low self esteem and for example re his hair that was greasy and hung down ie was dirty and not combed shows this. Also, from the sounds of it he was lily white, what we might call someone 'white trash' white these days.
Yes. He saw them has a subject (he), a verb (saw), and an object (them), so it is totally a sentence.
I think the right answer is B, I could be wrong (sorry if I am wrong)