Of the 33 vertebrae in the spinal column, which is correct?

Choice A reason: The human spinal column has 33 vertebrae: 7 cervical, 12 thoracic, 5 lumbar, 5 sacral (fused), and 4 coccygeal (fused). The 5 lumbar vertebrae, located in the lower back, support significant weight and allow flexibility, making this choice correct for the vertebral count. Choice B reason: The cervical spine consists of 7 vertebrae, not 12, which are designed for mobility and support of the head. The incorrect count of 12 aligns with the thoracic vertebrae, making this choice scientifically inaccurate for the cervical region. Choice C reason: The sacral region has 5 vertebrae, which fuse into the sacrum in adults, not 7. The sacrum forms part of the pelvis, providing stability. The incorrect count of 7 corresponds to the cervical vertebrae, making this choice incorrect. Choice D reason: The thoracic spine comprises 12 vertebrae, not 5, which articulate with the ribs to form the thoracic cage. The incorrect count of 5 aligns with the lumbar or sacral vertebrae, rendering this choice inaccurate for the thoracic region.