Karen Suffered Irreparable Damage to His Auditory Nerve by the Age

Karen suffered irreparable damage to his auditory nerve by the age of 2 years.What sounds can Karen hear?

A) He can hear airborne sounds,but not bone-conducted sounds.
B) He can hear bone-conducted sounds,but not airborne sounds.
C) He can hear low-frequency sounds waves when he is located in the right position.
D) He cannot hear any kind of sound.