Some species of plants are insectivorous. Why?

A They cannot synthesize certain vitamins themselves and depend on the insects digested by them.

B They have remained in that particular stage of evolution as living fossils, a link between autotrophs and heterotrophs.

C Their growth in shady and dark places does not allow them to understake sufficient photosynthesis and thus they depend on insects for nutrition.

D They are adapted to grow in nitrogen deficient soils and thus depend on insects for sufficient nitrogenous nutrition.