Which of the following food chains shows a spindle-shaped pyramid of numbers?

  • A
    Grass $\rightarrow$ Insects $\rightarrow$ Frog
  • B
    Phytoplankton $\rightarrow$ Zooplankton $\rightarrow$ Small fish
  • C
    Tree $\rightarrow$ Birds $\rightarrow$ Hawks
  • D
    Tree $\rightarrow$ Birds $\rightarrow$ Insects $\rightarrow$ Bacteria

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