Meristematic tissues in plants,

The correct option is A Have their walls made of cellulose
Characteristics of the meristematic cells:-

1) The cells are isodiametric with thin cellulosic cell walls with no secondary cell wall.

2) They divide rapidly hence, there is no stored food in these cells.

3) They are compactly arranged cells with no intercellular spaces.

4) They have a dense cytoplasm with a prominent nucleus.

5) Endoplasmic reticulum and mitochondria are not fully developed in these cells.

So, the correct answer is 'Have their walls made of cellulose'.