Sources of error in archimedes principle

This information confirms Archimedes' Principle, and its value in practical situations. Some possible sources of error are the measuring equipment, as some of the values are likely to be slightly inaccurate due to the fact that no piece of measuring equipment is perfectly accurate.

Edit the post so i can see the letters for each answer, and increase the points required so i'd be able to answer it.

Ibelieve the correct answer would be c.