The correct option is B Phellogen
Cork cambium or phellogen is a tissue found in many vascular plants as part of the periderm.
The cork cambium is a lateral meristem and is responsible for secondary growth that replaces the epidermis in roots and stems. It is found in woody and many herbaceous dicots, gymnosperms and some monocots, which usually lack secondary growth.
Cork cambium is one of the plant's meristems the series of tissues consisting of embryonic cells from which the plant grows. It is one of the many layers of bark, between the cork and primary phloem. The function of cork cambium is to produce the cork, a tough protective material. Thus, option B is correct.