Concept:Lateral meristem is the tissue responsible for increasing the girth or thickness of stems and roots.
It is made up of vascular cambium and cork cambium.
Explanation:Lateral meristems are positioned on the lateral sides of stems and roots.
They play a central role in secondary growth in flowering plants (angiosperms).
The vascular cambium produces secondary xylem and secondary phloem, which add to the width of the plant.
The cork cambium forms the protective outer layer of the bark.
The cortex, pericycle, and pith are permanent tissues that do not divide to cause growth in thickness.
Hence, of the given options, the cambium is the lateral meristem found in flowering plants.
Answer:C. cambium