Correct Answer: My coach told me that I should take a healthy diet.

Solution : The correct choice is the third option.

Indirect speech, also known as reported speech or indirect discourse, is a way of reporting what someone else has said without quoting their exact words.

The steps of conversion are as follows:

• The reporting verb "said" is changed to "told".
• There would be no change in the tense of the reported clause because it is the universal truth .
• The second-person pronoun "you" is changed to the first-person pronoun "I".
• The connector "that" is used to introduce the reported clause.

Therefore, the correct sentence is: My coach told me that I should take a healthy diet.