On what basis should emphasis finally be judged in a successful composition?

Correct answer: Whether visual priority supports the message, unity, balance and eye movement

The governing concept is emphasis as part of the whole composition, not as an isolated trick. Final judgment should ask whether the focal hierarchy communicates the intended message, preserves unity and balance, and guides the eye naturally through the work. A large object may still be ineffective if it disrupts those relationships. Therefore option B is correct; colour count, symmetry, or size alone cannot measure successful emphasis.