Sarah is the tallest person. She is taller than Jill and Jill is taller than Tom. So, the order from tallest to shortest is Sarah, Jill, Tom, Jack (who is the same height as Mike). Therefore, Sarah is definitively the tallest. If you need any clarification on how I arrived at this conclusion or if there is additional information I can provide, please let me know. I'm happy to explain further. The key is analyzing the height relationships stated and working out the logical hierarchy from the information given. Let me know if this helps or if you have any other questions!