I think transitions is very difficult to judge for these three.
I think Yu-Na has many areas where she does 4-5 crossovers in a row throughout the program. Also her jump entries (especially for lutz) are always the same and take a lot of time (especially lutz).
For Carolina, I agree with the fact that her entrances for jumps take long, and sometimes include little chases/hops/whatever they are (salchow), but due to her ability to gain speed without as many crossovers, her transitions other than her transitions going into jumps are quite good.
Mao, in my opinion, has the best transitions, especially into jumps. She does nice little steps into the loop and flip, and her steps before and after spins are very good, and keep the program going.
So I would place transitions:
Also, Choreographed Sequences:
Mao has a beautiful choreographed sequence that goes perfectly with the music.
Yu-Na's includes her beautiful ina-bauer which immediately goes into double axel , it's pretty. It's also speedy and interesting.
Carolina's goes with the music, and I like the idea of the many different/complicated arm movements, but I don't think there is enough "stuff." There is a spiral (relatively short) and a little hop, but there aren't many steps in the sequence.
For the choreographed sequence I place them: