Diagnosis from the DSM5 TR

Hi there,

I am studying for the MN National Board Exam for LMFT. I am currently studying the DSM-5 TR for the all the diagnosis. I am needing clarification and understanding about the criteria for Delusional Disorder (F22) for the following:


Criterion B: (Criterion A for schizophrenia has never been met. Note: hallucinations, if present, are not prominent and are related to the delusional theme). (e.g., the sensation of being infested with insects associated with delusions of infestation).
Criterion C: Apart from the impact of the delusion(s) or it ramifications, functioning is not markedly impaired, and behavior is not obliviously bizarre or odd.

I am not sure what those mean and if someone could clarify those for me that would be greatly appreciated!