In ecological pyramid the base always represent the $...A...$ and the apex represents $...B...$ Here $A$ and $B$ represents

  • A

    $A-$producers; $B-$top level consumers

  • B

    $A-$top level consumer; $B-$producers

  • C

    $A-$producers; $B-$secondary consumers

  • D

    $A-$producers; $B-$primary consumers

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$...A...$ is required for higher primary productivity. $...B...$ have the lowest primary productivity as the soil is deficient in moisture.

Choose the correct option for $\mathrm{A}$ and $\mathrm{B}$