The passage says that:
- The Cecchetti style is the "purest" method
- They use it because of its consistent teaching and technical preparation
- The repetitive nature builds strong technique
- This technique provides a foundation for personal artistry
- Many of their students have pursued professional careers
(A) The Russian Vaganova method and the French style are both inferior to the Cecchetti method of teaching.
The instructor actually "acknowledges the value" of the other methods, not dismissing them as inferior. the instructor’s conclusion does not depend on them all being inferior, only that Cecchetti is especially effective for strong technique => Eliminate
(B) The best professional dancers in the world have been trained in the Cecchetti method.
The instructor only claims that many of their dancers have pursued professional careers, not that the world's best dancers use this method => Eliminate
(C) Developing strong technique is more important than developing artistry in dancers.
The instructor presents technique as a foundation for artistry, not as
more important than artistry => Eliminate
(D) Individual artistic style is developed best when built upon a foundation of strong technique.
This directly reflects the instructor’s explanation: that daily discipline and technical repetition provide a “basis” upon which a dancer can then develop personal artistry. => Keep
(E) All ballet schools should shift their teaching styles to the Cecchetti method.
The instructor makes no universal claim about what other schools should do => Eliminate
The answer is (D)