13. Which of the following is a general nature of plant-pollinator interactions?
A. Tight one to one co-evolutionary partnership B. A plant species is pollinated by a few pollinator species 
C. Plants rely on deceit to achieve pollination by pollinator species 
D.Most pollinators benefit the plant by providing pollinator services,but  disadvantage the plant at the same time by laying eggs into the flower and thereby negatively affects fruit formation