Which of the following is the correct order of widths from bottom to top?

To understand why the provided order is correct, it's important to recognize the anatomical positions of the measurements of the skull.

When describing the skull's widths, the bimandibular width is the distance between the two mandibular angles, making it the narrowest width as it lies at the base of the skull. Moving upward, the bizygomatic width measures the distance between the two zygomatic bones (cheekbones), which is wider than the bimandibular width. Finally, the biparietal width, which is the measurement across the parietal bones, is the widest of the three, as it spans a greater part of the upper skull.

Thus, when ordered from bottom to top, bimandibular is indeed the first, followed by bizygomatic, and the widest biparietal is at the top. This sequential understanding of anatomical landmarks clarifies the correct order of widths.