An atom has the same number of which two particles ?

Which statement best paraphrases these sentences from the text

What statements best describes king's purpose in writing the letter?

To choose a good persuasive essay topic, begin with a big idea, narrow it down, and a. then narrow it down more; it is impossible to have a topic that is too narrow. b. do some research to see what you should write about c. specify-ask a question you want answered in your argument