- (A) Schizophrenia is typically a condition that requires medical treatment, such as antipsychotic medications, due to its severe symptoms and the biological components that contribute to its development. The humanistic approach, which focuses on self-actualization, personal growth, and empathy, may not be the most effective treatment for a complex and severe condition like schizophrenia.
- (B) Mild depression can benefit from humanistic therapy, as it focuses on enhancing the individual's sense of well-being and self-worth. This approach helps people with mild depression by fostering self-acceptance and personal growth.
- (C) Paranoia can involve significant delusions and cognitive distortions, which often require more structured interventions, such as cognitive-behavioral therapy or medications, rather than humanistic approaches. While humanistic therapy might help in some cases, it would be less effective in treating paranoia.
- (D) Childhood abuse is an issue that can benefit from humanistic therapy as it promotes healing through self-awareness and emotional expression. Humanistic therapy can offer a safe, empathetic environment for victims of childhood abuse to address past traumas.
Thus, the correct answer is:
\[
\boxed{A), C)}
\]