Final answer:
The notation in the patient's medical record that supports the diagnosis of mania is option e: Patient presents with a happy, near euphoric demeanor.
Step-by-step explanation:
The notation in the patient's medical record that supports the diagnosis of mania is option e: Patient presents with a happy, near euphoric demeanor. Mania is a key symptom of bipolar disorder and is characterized by an elevated, expansive, or irritable mood. The patient's presentation of a happy and euphoric demeanor aligns with the symptoms of mania.