Hey there!
Here is your answer:
The proper answer to this question is option B "when you are writing an analysis".
Reason:
Textual evidence is usually a specific point in something that are used for like quotes and such.
Also...
Analysis would require textual evidence because they are basically summing up a certain even that had taken place.
Therefore the answer is option B.
If you need anymore help feel free to ask me!
Hope this helps!
~Nonportrit