Option 1 -> While she mentions envy of other dancers, this doesn't explain why she equates dance with struggle.
Option 2 -> This is incorrect - her parents forced her to dance; she didn't have to convince them of any passion.
Option 3 -> Too vague and doesn't directly connect to the "struggle" statement.
Option 4 -> She was an "unwilling child, tired from a whole day at school" who was forced to attend lessons under "trying conditions" - she had to persist and work hard despite not wanting to dance initially.
Hence, Option 4 -> The narrator's statement that "to dance means to struggle" reflects her personal experience of being forced into dance lessons as an unwilling child, having to work through difficult conditions (crowded trains, exhaustion from school) to eventually master the art, making her journey a struggle rather than a natural calling -> correct