A large opening at the base of the skull that the spinal cord passes through.
The correct option is A.
What is a foramen magnum?
The foramen magnum is a large oval-shaped opening present in the occipital bone.
There are several oval openings in the skull, it is one of them.
The medulla oblongata passes through it, which connects to the spinal cord and brain.
The correct option is A, A large opening at the base of the skull that the spinal cord passes through.
Learn more about the foramen magnum, here:
https://brainly.com/question/9803103
