Select the correct indirect speech form of the given sentence.

Mother said, "I'm worried about your safety."

Mother told me that she was worried about my safety. 

The correct indirect speech form of the given sentence is:

Mother told me that she was worried about my safety.

The other options are incorrect because they do not follow these rules:

• Mother said she is worried about your safety. - This sentence does not change the present tense to the past tense for the auxiliary verb "is."
• Mother told me that she had been worried about my safety. - This sentence changes the present tense to the past perfect tense for the auxiliary verb "was," which is not necessary in this case.
• Mother said that I was worrying about your safety. - This sentence changes the subject of the sentence from "she" to "I," which is incorrect.