A. She <u>hasnt</u> let me know if it's time to leave yet. - the hasnt should be hasn't
<span>B. She hasn't let me know if it's time to leave yet. - this one has no errors </span> C. <span>She hasn't let me know if <u>its</u> time to leave yet. - "it is" is spelled it's</span>
D. She <u>hasnt</u> let me know if <u>its</u> time to leave yet. - the "its" is wrong and "hasnt"