Step 1: Understanding the Concept:
Cream separation efficiency depends on temperature.
There is an optimum temperature range.
Step 2: Key Formula or Approach:
No specific formula.
Need to know the factors affecting cream separation.
Step 3: Detailed Explanation:
After 45-50°C, separation efficiency does not increase markedly.
This is because the density difference between serum and fat does not increase significantly.
Viscosity continues to decrease but density difference is the key factor.
Protein precipitation and air entrapment are not the main reasons.
Thus, the density difference does not increase.
Step 4: Final Answer:
The efficiency does not increase because the difference in density between serum and fat will not increase.
Hence, the correct option is (A).