The cervical vertebrae are a group of bones in the human body that make up the neck region. Option 1 states that there are 5 cervical vertebrae, which is incorrect. There are actually more than 5 cervical vertebrae in the human body.

Option 2 states that there are 7 cervical vertebrae, which is the correct answer. The human body has 7 cervical vertebrae, which are located in the uppermost part of the spinal column. These vertebrae support the weight of the head and allow for a wide range of motion in the neck.

Option 3 states that there are 8 cervical vertebrae, which is incorrect. Again, there are actually 7 cervical vertebrae in the human body.

Option 4 states that there are 12 cervical vertebrae, which is also incorrect. While the human body does have 12 vertebral bones, they are part of the thoracic spine, not the cervical spine.

In conclusion, the correct answer is option 2. The human body has 7 cervical vertebrae.