I wouldn't count on my answer for your life but I'm pretty sure that it's C sorry if I couldn't help
Answer:
Ultimately, the key to a successful research project lies in iteration: the process of returning again and again to your research question, methods, and data, which leads to new ideas, revisions and improvements. It is easy to think of research as a step-by-step “1,2,3” process, but it is important to be fluid and open to change.
Explanation:
When diagramming compound sentences, you have to create lines separating the subject, verb and object. Then you have to create broken lines downward: that is for the conjunction. Then you will do the same, separate the subject verb and object and so on. It will be like this:
Sarah | loved | sound - identify all the other modifiers and group them below. Then create broken lines downward for the conjunction "and" then do the same.
Answer:
Becuz its very delicate and can burst anytime!!!!!!!!!