Topic: Idioms & Phrases,

Best Answer Explained in Below-:

The phrase "All in all," often translated to "সর্বেসর্বা" in Bengali, carries the meaning of being supreme or the ultimate source of authority and power. The term suggests a totality or completeness in power and control, thus aligning closely with the concept of being "all powerful."

When we dissect the options:

- A) "All powerful" directly signifies an entity that possesses total power and authority, aligning with the original phrase's connotation.
- B) "Powerless" conveys the opposite meaning, suggesting a lack of power, which contradicts the idea of being supreme.
- C) "Only one" implies singularity, but does not capture the essence of having authority or control over all.
- D) "Who has lost power" also conveys an opposite meaning, indicating a diminishment of authority.

Given these interpretations, option A stands out as the most accurate representation of "সর্বেসর্বা." It encapsulates the essence of ultimate power and authority, making it the correct choice in the context of the phrase "All in all."