I'd go for the last option or D. both are more brilliant and athletic than anyone else
Hey there,
Answer:
1) It must be reliable source that provides you with the correct information
2) It is important to use sources in your academic research paper as audience will expect you to have backed up your answers.
3) The source must be trustable
Hope this helps :D
<em>~Top♥</em>
The option 'd' gives a monotonous meaning to the sentence. A better word would be 'singing' or 'chirping'