A lot of things are necessary to make sure your work won't be seen as plagiarism. For example it is useful to keep research notes that show your work flow. If you do use other sources, make sure to cite them and especially If you quote them make sure you use citation marks and give the source.
Answer: Rivers provided both fresh water and good soil.
Answer:
It paved the way with separation of powers, limits the powers of the king and queen, enhances the democratic election and bolsters freedom of speech.
The Taj Mahal was built with influences from Mughal and Turkish architectural styles.
The answer would be B !!!!