Change direct speech into indirect speech.

The nurse said," I have been working for ten hours continuously."

Direct speech is that speech that is used to quote the exact words spoken. Indirect speech is that speech that tells you what someone said but does not use the person's actual words. Pronouns usually change from first or second person to the third person except when the speaker reports his own words. Option A is correct because the pronoun "I" has been changed to "she". Reporting speech in direct speech is in the present continuous tense. While converting to indirect speech, it should be past continuous tense.