If 10-10 elements are transferred from Set A to Set B, then Set B to Set C and then from Set C to Set A but the received elements can not be transferred to the next set. E.g. the elements obtained from Set A can not transferred to C through Set B. The average of which Set is maximum :

Options

A. A
B. B
C. C
D. can't say

Answer

To solve the problem step by step, we need to analyze the transfers between the sets and how they affect the averages of each set.

### Step-by-Step Solution:

1. **Understanding the Sets and Transfers**:
- We have three sets: Set A, Set B, and Set C.
- Each set initially contains a certain number of elements. However, the specific elements or their values are not provided.
- We will transfer 10 elements from Set A to Set B, 10 elements from Set B to Set C, and 10 elements from Set C to Set A.

2. **Transfer Process**:
- **Transfer from Set A to Set B**:
- 10 elements from Set A are moved to Set B.
- **Transfer from Set B to Set C**:
- 10 elements from Set B (which now includes the elements transferred from Set A) are moved to Set C.
- **Transfer from Set C to Set A**:
- 10 elements from Set C (which now includes elements from Set B) are moved to Set A.

3. **Restrictions on Transfers**:
- The elements transferred cannot be transferred again to the next set. For example, the 10 elements transferred from Set A to Set B cannot be transferred to Set C.

4. **Average Calculation**:
- The average of a set is calculated as the sum of the elements in the set divided by the number of elements in that set.
- Since the specific values of the elements in each set are not given, we cannot calculate the exact averages for Set A, Set B, or Set C.

5. **Conclusion**:
- Since we do not have any information about the values of the elements in each set, we cannot determine which set has the maximum average.
- Therefore, the answer to the question is that we cannot say which set has the maximum average.

### Final Answer:
- **Option D: Can't say**