Correct option is A
Direct Speech- it means reporting the message of the speaker in the exact words as spoken by him.
Indirect Speech- Itis speech which tells you what someone said, but does not use the person's actual word.
To change the sentence from direct to indirect speech-
Replace the verb "said to" with "told" in indirect speech.
Change the tense of the verb according to the context of the sentence.
In this case, since the original sentence is in the future tense ("will be breaking into the safe"), we need to change it to the future in the past tense ("would be breaking into the safe") in the indirect speech.
Pronouns in the original sentence need to be changed according to the context of the sentence.
Therefore, option (a) is the correct answer.