Read the given statements regarding a cell organelle.
(i) It contains water, sap, excretory products and other unwanted materials.
(ii) It is bounded by a single membrane called tonoplast.
(iii) In plant cells, it can occupy upto 90 % of cellular volume.
(iv) Its contents form cell sap.
(v) It maintains turgor pressure.
The above features are attributed to
A. lysosome
B. vacuole
C. peroxisome
D. mitochondrion.