Respuesta :
It might be said that the correct sentences is C  "She is the person whom he had found sleeping in the library". This is because whom is correctly used.Â
In the case of A and B, They are incorrect because instead of who it should have been whom, the correct pronoun.
On the contrary; sentence D should be who instead of whom.Â
In the case of A and B, They are incorrect because instead of who it should have been whom, the correct pronoun.
On the contrary; sentence D should be who instead of whom.Â