Answer:
I am pretty sure it is the C.
Explanation:
The reasons is that A and D are broken apart too much and B is just a run on sentence.
The preparation stage is the stage where you would be making notes about the topic because when you are makInch notes before they talk about the topic, then you are talking about the preparation stage.
You should include a conjunction. The conjunction you should include is but
Glazing pottery can be tricky, but the stunning results make the effort worthwhile
