Which of the following food chain shows spindle shaped pyramid of number?

  • 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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