A.Lichens - Mutualism - symbiosis which is beneficial to both organisms involved.
B.Hypertrophy - Growth - increase in size of skeletal muscle through a growth in size of its component cells.
C.Cuscuta - Parasitism - relationship between two species of plants or animals in which one benefits at the expense of the other, sometimes without killing the host organism
D.Nepenthes - insectivorous plant - carnivore - an animal that gets food from killing and eating other animals.
So the correct option is 'lichens'.