The vascular cambium

is part of a plant's secondary growth
produces secondary phloem and xylem tissue
increases in ring size each year
all of the above

Option B.

Explanation:

The vascular cambium is referred as the main part of the dicot and gymnosperm plant.

Vascular cambium helps in producing secondary xylem and phloem. Xylem is produced inwards, towards the pith and phloem is produced outwards, towards the bark.

Vascular cambium do not support transport water, minerals or food through the plant and also known as main cambium, bifacial cambium, and wood cambium.

Vascular cambium are found in dicots and gymnosperms and not in monocots so it lack secondary growth.

Hence, the correct option is B.

d i think its   answer d