What is the best way to revise this sentence so that it conveys clear, concise ideas and does not change the meaning of the sentence?

i rang the doorbell, but no one came to the door, and i was sure that this was the right address, so i waited, and then i saw a curtain move.

a. i rang the doorbell, and i saw a curtain move upstairs.
b. the curtains moved in the window the moment i rang the doorbell.
c. i was sure i was at the right address, but no one came when i rang the bell.
d. i rang the doorbell, but no one came to the door. i was sure this was the right address. while i waited, i saw a curtain move.

Could someone me with this question?

Read the excerpt from frederick douglass’s speech “what to the slave is the fourth of july? ”go where you may, search where you will, roam through all the monarchies and despotisms of the old world, travel through south america, search out every abuse, and when you have found the last, lay your facts by the side of the everyday practices of this nation, and you will say with me, that, for revolting barbarity and shameless hypocrisy, america reigns without a rival. what is one way that douglass achieves his purpose of persuading the reader to see his point of view? by relating as many facts and statistics to the reader as possibleby using familiar and casual language to make the reader feel comfortableby using gentle language to evoke a sense of calm and tranquilityby repeating the word “you” to directly relate to the reader

Someone get back to me , i really don’t get this