IMSO 2018 Science International - Theory I Question 1

A food web is given below:
How many primary consumers and secondary consumers are involved in the
food web, respectively?
A. 2 and 3
B. 2 and 4
C. 3 and 3
D. 3 and 4
green plant
caterpillar
snail
grasshopper
chicken
frog
bird
snake