Reality show denies faking

Popular singing competition The Voice of China has denied misleading viewers after some noticed the hairstyle of one of the judges changed while she was commenting on a performance. Na Ying's hair at first appeared curly but changed to straight after 16 seconds and then turned curly again after a further 30 seconds. The change aroused suspicion that the show was directed according to a script rather than singers' real performances.

How many times did the judge's hairstyle change?

A. 1

B. 2

C. 3