Step 1: Concept
Isotonic saline solution is 0.9% (w/v) NaCl.
Step 2: Meaning
"Hyper" means above or higher than the reference standard.
Step 3: Analysis
A solution with a concentration higher than the cell's internal environment (0.9% NaCl) is hypertonic.
Step 4: Conclusion
Hence, correct answer is (C).
Final Answer: (C)