I believe it to be A.) dissertations, unpublished reports
Calm down. I have really bad teeth too, when my teeth where developing I got a fever and now they are weak. I have to get braces and I am scared too but trust him. Think about how afterwards you will have nice straight teeth. I am so sorry you are horrified. Wish you the best of luck!
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This is an example of convergence evidence.
Convergence evidence refers to the type of evidence that derives from independent sources that couldn't be objectively measured by the researcher.
In the case above, the data about the satisfaction came from the subject's personal evaluation and experiences
