Correct Answer: She said that she had called the day before, but there was no response.

Solution : The correct choice is the first option .

Indirect speech is speech that tells you what someone said but does not use the person's actual words. In reported speech, when reporting someone else's statement, we often shift the pronouns and verb tenses.

The steps of conversion are as follows:

• There would be no change in the reporting verb.
• The connector "that" is used to introduce the reported clause.
• The first-person pronoun of the pronoun "I" is changed to the third-person pronoun "she".
• The past tense "called" is changed to "had called" (simple past tense converted to past perfect tense) in the reported speech because we are reporting an action that occurred before the time of reporting.
• The time expression "yesterday" is changed to "the day before" to maintain the sequence of tenses.

Therefore, the correct answer is: She said that she had called the day before, but there was no response.