The correct option is B Sides of roots and stems
There are three types of meristematic tissues. Apical meristems are found at the tip of stems and roots. Lateral meristems are found along the sides of roots and stems . They play a vital role in increasing the width or diameter of stems and roots. Intercallary meristems are found at the bases of young leaves and internodes. They are mainly responsible for further lengthening of stems and leaves. So, option B is correct.