The order of organisms in an aquatic food chain is:

• A
  Bacteria $\rightarrow$ Seal $\rightarrow$ Diatom $\rightarrow$ Fish $\rightarrow$ Crustacea
• B
  Crustacea $\rightarrow$ Seal $\rightarrow$ Fish $\rightarrow$ Polar Bear $\rightarrow$ Diatom
• C
  Polar Bear $\rightarrow$ Diatom $\rightarrow$ Seal $\rightarrow$ Crustacea
• D
  Diatom $\rightarrow$ Crustacea $\rightarrow$ Fish $\rightarrow$ Seal $\rightarrow$ Bacteria