C–I'm 98% sure because it's the only one that look irregular
Okay, so a meter is a measure in length. Like a foot, or an inch. To square a measure of length, four equal measures of length (such as a meter) are put together to form a square. This is used for things like construction, or home refurbishing. Ex. 'My kitchen floor is 26 square meters'
She went 10 feet up because she is below sea level.