To convert the given direct speech into indirect speech, we need to follow certain grammatical rules. The direct sentence given is: "I said, 'The teacher likes me'."

The sentence is structured in the past tense ("I said"), and we have to make sure the statement in quotes is also appropriately shifted as per the rules of reported speech.

1. Change of Pronouns:
   • The pronoun "I" (subject) in the speaker's statement remains as "I" since it refers to the speaker who is repeating what they said.
   • In "The teacher likes me," the pronoun "me" changes according to the reporting narrator's perspective. Thus, it doesn't change here as well, because the sentence is about the speaker talking about themselves.
2. Change of Tense:
   • Since the reporting verb "said" is in the past tense, the present tense in the reported sentence ("likes") is shifted to the past tense.
   • Therefore, "likes" becomes "liked."
3. Structure:
   • The sentence structure shifts from direct to indirect speech by replacing the comma and quotes with 'that'.

Following these rules, the transformed sentence becomes:

"I said that the teacher liked me."

Therefore, the correct indirect form of the given sentence is: I said that the teacher liked me.

Let's review the given options:

• I said that the teacher was liking me. - Incorrect as "was liking" is not the correct past form for "likes."
• I said that the teacher is liking me. - Incorrect as the tense has not shifted to past tense.
• I said that the teacher liked me. - Correct as it adheres to all the rules of converting direct speech to indirect speech mentioned above.
• I said that the teacher likes me. - Incorrect since the present tense remains unchanged which is not allowed in indirect speech when the reporting verb is in the past.