The answer to this question is option 'B) Not at all'. The father does not want his son to move around in his own world.

Explanation:
The given question is related to the relationship between a father and his son. In order to understand the answer, let's analyze the possible options one by one.

a) Yes, absolutely: This option implies that the father wants his son to move around in his own world. However, this contradicts the given information in the question, which states that the father does not want his son to do so. Thus, this option is incorrect.

b) Not at all: This option suggests that the father does not want his son to move around in his own world. This aligns with the information provided in the question. The father may have concerns about his son being isolated or disconnected from the real world. Therefore, this option is the correct answer.

c) Maybe: This option implies uncertainty and does not provide a clear answer. It does not provide any specific indication of the father's desires regarding his son's behavior. Therefore, this option is not the correct answer.

d) None of the above: This option implies that none of the given options are correct. However, option 'B) Not at all' correctly represents the father's desires. Thus, this option is incorrect.

In conclusion, the correct answer is option 'B) Not at all' as it accurately reflects the father's wishes for his son not to move around in his own world.