Short Answer
Baryon number violation, C and CP violation, and departure from thermal equilibrium is the best answer.
Astrophysics questions often combine observation with first-principles physics. The winning move is to connect the measurement being made, such as luminosity, spectrum, redshift, or orbit, to the physical model behind it.
Sakharov (1967): all three conditions — baryon violation, C/CP violation, and non-equilibrium — are necessary for net baryon asymmetry.
Why This Answer Is Correct
This is a Hard-level question in Astrophysics & Cosmology. The prompt is really testing whether you can connect the concept to its defining physical relationship instead of picking a nearby-but-wrong term.
Good astrophysics reasoning always asks what the telescope actually measured and what physical quantity that measurement traces.
Choices At A Glance
- A. Baryon number violation, C and CP violation, and departure from thermal equilibrium
- B. Only baryon number violation
- C. High temperature and C symmetry
- D. Only departure from equilibrium
When similar options appear on an exam, eliminate the ones that break the core law, use the wrong units, or confuse a definition with a consequence.
Topic Snapshot
Topic: Astrophysics & Cosmology
Difficulty: Hard
Best next move: Re-state the governing law in your own words, then solve one more example from the same topic before moving on.