Final answer:
Predominant organelles in salivary gland cells are likely to be ribosomes attached to the rough endoplasmic reticulum and smooth endoplasmic reticulum, due to their roles in protein and lipid synthesis needed for enzyme production and secretion.
So, the correct answer is B.
Step-by-step explanation:
The organelles that are predominant in salivary gland cells are involved in the synthesis and processing of proteins given that these cells produce and secrete enzymes. The rough endoplasmic reticulum (RER) is characteristically studded with ribosomes and is a major site of protein synthesis. This would also imply a significant presence of smooth endoplasmic reticulum (SER), which is involved in the synthesis of lipids, including those used in the formation of membranes.
Together with the RER and SER, these organelles provide the capacity for protein and lipid synthesis, necessary for the production and secretion of salivary enzymes. Therefore, the predominant organelles in salivary gland cells are likely to be Ribosomes attached to the RER and SER.
So, the correct answer is B. Ribosomes attached to the rough ER and smooth ER.