My sister, an inexperienced rider, was found sitting on the bicycle ______to balance it.

My sister, an inexperienced rider, was found sitting on the bicycle______to balance it.

My sister，an inexperienced rider，was found sitting on the bicycle _________ to balance it．

　　A．having tried　　　　　　　B．trying

　　C．to try　　　　　　　　　　D．tried