The figure given below shows the alimentary canal of cockroach with few structures labelled as $1,2,3$ and $4 .$ Identify the correct identification of the structure which is also called proventriculus and helps in grinding the food particles.

1274-36

  • A

    $1$

  • B

    $2$

  • C

    $3$

  • D

    $4$

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