Ocean bulge occur when the gravitational attraction between earth and the moon causes the water in the oceans which can move to be attracted towards the moon. This causes a bulge in the ocean that is closest to the moon as the earth rotates and the location of the effected water changes.
A is the answer. You would need soil with different amounts- including no amount- to determine how the fertilizer affects the plants Since you are measuring the height a ruler would be a good idea as well.
