B. when you want to show that events did not occur at the same time
Explanation:
Let's see an example that shows it in a very obvious way
"She will draw tomorrow you as well as she drew me today"
We have the verb "To draw" with <u><em>will</em></u> for future and also, in the same sentence, in its past form <u><em>drew</em></u>. In this way, you can make sure that those two things happened or will happen during different periods of time.
the personification is given to the guitar by saying keepers of our secrets and prayers when in reality guitars can not keep secretes or prayers because guitars are not human, therefore they are not given that ability