The most dense object is depicted by option B, which shows closely packed molecules. Objects with molecules closely packed together have a higher density compared to those with scattered or fewer molecules.
Option B, depicting closely packed molecules, represents the most dense object. Density is defined as mass per unit volume. In a material with closely packed molecules, there is a higher mass within a given volume, resulting in greater density. This arrangement signifies a higher concentration of matter in a confined space, a characteristic associated with solid and dense materials. Objects with scattered molecules (Option C) or molecules present only on one side (Option D) have lower density due to a lower mass-to-volume ratio. Option A, with molecules on opposite sides, doesn't necessarily convey a high concentration and may not represent a particularly dense object. Therefore, based on the principles of density and molecular arrangement, Option B, showing closely packed molecules, corresponds to the most dense object among the given choices.