If those two are your only choices then the answer is none of the above.
<em>Attached is a cumulative frequency table for your data.</em>
If you take a look at the two tables given, the frequencies were not tallied properly. If the frequency column is wrong, then the cumulative frequency will be wrong. The answer is then none of the above or find one that matches the table attached.
25 feet above sea level means she travelled 25 feet to the surface of the sea. She would have to descend (37-25=12) 12 more feet to achieve 37 total feet of travel, so she descended 12 feet below sea level.