Final answer:
If a person exhibits characteristics such as talking fast, having excessive energy, making grandiose plans, and being hyperactive, but shows no signs of depression, they are likely suffering from Bipolar disorder (c).
Step-by-step explanation:
If a person exhibits characteristics such as talking fast, having excessive energy, making grandiose plans, and being hyperactive, but shows no signs of depression, they are likely suffering from Bipolar disorder (c). Bipolar disorder is a mental illness characterized by extreme mood swings, from manic episodes where the person experiences heightened energy and euphoria, to depressive episodes where they feel extreme sadness and loss of interest. It is important for individuals with these symptoms to seek professional help for proper diagnosis and treatment.