Final answer:
The Sacro-occipital technique uses pelvic blocks and gravity to aid in the circulation of cerebrospinal fluid and reduce restrictions. It's a chiropractic method aimed at improving the relationship between the sacrum and the occiput.
Step-by-step explanation:
The technique that uses pelvic blocks and the force of gravity to reduce restrictions in the flow of the cerebrospinal fluid is the A. Sacro-occipital technique. This technique is a gentle chiropractic method that helps restore normal cerebrospinal fluid circulation by using blocks placed under the pelvis and the natural force of gravity. It's an alternative approach to spinal manipulation that aims to correct dysfunctions in the relationship between the sacrum and the occiput, which can impact the cerebrospinal fluid flow.