Step 1: Understanding the Concept:
Social change is a complex process.
It has various characteristics.
Step 2: Key Formula or Approach:
No specific formula.
Need to understand social change.
Step 3: Detailed Explanation:
Statement A: Social change is universal - correct.
Statement B: It does not always depend on willingness - correct.
Statement C: Speed is not constant - incorrect.
Statement D: It has both qualitative and quantitative aspects - incorrect.
Thus, A and B are correct.
Step 4: Final Answer:
A and B are correct.
Hence, the correct option is (A).