5. Study the food chain below. Mosquito
 ==> Frog ==> Snake ==> Crocodile ==> Plant  
Which of the following statement about the food chain is correct? 
a. The food chain can be commonly observed in a garden. 
b. There are four predators and four preys in the food chain. 
c. The crocodile is the predator of frog. 
d. The crocodile depends on the plant for energy.