The correct answer is A. He said that he would go as soon as it was possible.
The sentence “He said, ‘I shall go as soon as it is possible'” is in the past tense. This means that the speaker is reporting something that happened in the past. The speaker is saying that the person they are talking about said that they would go as soon as it was possible.
Option B is incorrect because it uses the present tense. The sentence “He told he will go as soon as possible” is in the present tense, which means that the speaker is saying something that is happening now. However, the sentence “He said, ‘I shall go as soon as it is possible'” is in the past tense, which means that the speaker is reporting something that happened in the past.
Option C is incorrect because it uses the interrogative form. The sentence “He asked whether to go as soon as it was possible” is in the interrogative form, which means that the speaker is asking a question. However, the sentence “He said, ‘I shall go as soon as it is possible'” is in the declarative form, which means that the speaker is making a statement.
Option D is incorrect because it uses the modal verb “suggest”. The sentence “He suggested that he will go as soon as it was possible” uses the modal verb “suggest”, which means that the speaker is making a suggestion. However, the sentence “He said, ‘I shall go as soon as it is possible'” is a statement of fact, not a suggestion.