1 is wrong, 4 is wrong.
The answer could be either 2 or 3, but it is most likely 2, as the call to action generally takes place at the very end of an essay if it's written correctly.
Electrons are the negatively charged particles of atom. Together, all of the electrons of an atom create a negative charge that balances the positive charge of the protons in the atomic nucleus.
B, Plot summary. My reasoning is because this will summarize the plot happening in this sentence.
Hope this helped! :)
Primary sources, for example, are witnesses. If there was a witness to a murder, they would be considered a primary source because they can give the police a first hand view of what happened. Published research, newspaper articles, and other media would be secondary sources as they are not at the event but just commentating and/or making observation from what they can tell from videos and gossip. Let me know if you have any more questions.
