The correct option is
A Both producer and primary carnivore
Nepenthes is also known as tropical pitchers plants, which comes under a group of carnivorous plants. They act as both producer and primary carnivores. It is a producer because it is able to photosynthesize its own food. It is a primary carnivore as well because it feed on insects for obtaining nitrogen.
So, the correct option is 'Both producer and primary carnivore'.