The correct answer is: A. The man told the boy that it only seems complicated because he was not used to it.
The man is trying to reassure the boy that the task is not as difficult as it seems. He is saying that the boy only thinks it is complicated because he is not used to doing it. Once the boy gets used to it, he will realize that it is not so difficult.
Option B is incorrect because it uses the present tense “is” instead of the past tense “was.” The man is talking about a specific time in the past when the boy was not used to the task.
Option C is incorrect because it uses the past tense “seemed” instead of the past tense “was.” The man is talking about a specific time in the past when the boy was not used to the task.
Option D is incorrect because it does not accurately reflect what the man said. The man did not say that the task is not complicated, he said that it only seems complicated because the boy is not used to it.