Which is the correct sequence in the food chain in a grassland?

• A
  Grass $\rightarrow$ wolf $\rightarrow$ deer $\rightarrow$ buffalo
• B
  Bacteria $\rightarrow$ grass $\rightarrow$ rabbit $\rightarrow$ wolf
• C
  Grass $\rightarrow$ insect $\rightarrow$ birds $\rightarrow$ snakes
• D
  Grass $\rightarrow$ snake $\rightarrow$ insect $\rightarrow$ deer