Step 1: Understanding the question.
The question asks for a Spanish film that deals with the sensitive topic of euthanasia — the act of intentionally ending a life to relieve suffering.
Step 2: About the movie “Mar Adentro.”
Mar Adentro (The Sea Inside) is a 2004 Spanish film directed by Alejandro Amenábar. It tells the real-life story of Ramón Sampedro, a Spanish man who fought for his right to die after being paralyzed from the neck down.
Step 3: Analysis of options.
- (1) Las Princesas: Focuses on prostitution and friendship, not euthanasia.
- (2) Todo Sobre mi Madre: Centers around motherhood and gender identity, not euthanasia.
- (3) Las Edades de Lulú: A film about erotic discovery, unrelated to euthanasia.
- (4) Mar Adentro: Correct — it directly addresses the theme of euthanasia.
Step 4: Conclusion.
Thus, the film that deals with the theme of euthanasia is Mar Adentro.