Which Statement Is True Regarding Lymphocyte Specificity

Which statement is true regarding lymphocyte specificity?

A) Genetic rearrangement in the DNA that codes for antigen receptors results in up to 10 trillion permutations in the variable regions of B- and T lymphocyte-receptors.
B) There is a different gene for every possible antigen that a lymphocyte may encounter.
C) B lymphocytes have specificity for a large number of different antigens,however T lymphocytes can recognize only 500 antigens corresponding to the number of gene segments that code for the antigen receptors.
D) B- and T cell-receptors are identical and both recognize up to 500 antigens corresponding to the gene segments that code for the antigen receptor variable regions.