Given below are two statements :

Statement $I$ : Bone marrow is the main lymphoid organ where all blood cells including lymphocytes are produced.

Statement $II$ : Both bone marrow and thymus provide micro environments for the development and maturation of T-lymphocytes.

In the light of above statements, choose the most appropriate answer from the options given below :

• A

  Both Statement $I$ and Statement $II$ are incorrect.

• B

  Statement $I$ is correct but Statement $II$ is incorrect.

• C

  Statement $I$ is incorrect but Statement $II$ is correct.

• D

  Both Statement $I$ and Statement $II$ are correct.