The correct option is B Cell they give rise to future tissue
The histogen theory was given by Hanstein (1870), According to this, there are 3 groups of initials in the shoot apex. The three principal tissues of the root vascular cylinder, cortex and epidermis originate from three groups of meristematic cells or histogens in the apical meristem plerome, periblem and dermatogen respectively.
Thus, the correct answer is option B.