The correct option is B Protoplast
Protoplasts are the isolated cells whose cell wall is removed and are bounded by plasmalemma (protoplasm).
Chloroplasts are green coloured plastids, which comprise green-coloured pigments within the plant cell and are called the chlorophyll.
Cytoplasm is a fluid that fills up the cells is referred to as the cytoplasm. It encompasses the cytosol with filaments, ions, proteins, and macromolecular structures and also other organelles suspended in the cytosol.
Endoplasmic reticulum is a complex network of tubular membranes exclusively present in the cytoplasm of the eukaryotic cell.