One observation that regards the magnetic stipes on the ocean floor that would disprove the theory of platetectonics would be?

Answer 1

These articles about magnetic stripes support plate tectonics. Perhaps your question is worded incorrectly.

http://pubs.usgs.gov/gip/dynamic/stripes.html

http://platetectonics.pwnet.org/story_tectonics/theory/magnetic_striping.htm

http://eqseis.geosc.psu.edu/~cammon/HTML/Classes/IntroQuakes/Notes/plate_tect01.html