Pitcher plant traps insects because it
- is a heterotroph.
- grows in soils which lack in nitrogen.
- does not have chlorophyll.
- has a digestive system like human beings.
Pitcher plant is an insectivorous plant that grows only in soils which do not contain sufficient nitrogen. These plants trap insects by various methods, kill them and digest them to obtain nitrogen compounds for their growth.
The correct option is B.