The data table shows the sound levels of common noise sources. A 2 column table with 13 rows. Column 1 is labeled sound in decibels with entries 140, 130, 120, 110, 100, 90, 80, 70, 60, 50, 40, 30, 20. Column 2 is labeled noise source with entries jet engine at 25 meters, jet aircraft at 100 meters, rock and roll concert, pneumatic chipper, woodworking machines, chainsaw, heavy truck traffic, business office, conversational speech, library, bedroom, secluded woods, whisper.
Which profession has the greatest risk of sound damage to the ear?

woodworker
librarian
teacher
truck driver