What happens next in this paragraph?

How to study intracranial pressure in humans 
Define intracranial pressure. 
Intracranial pressure can be high or low. Low intracranial pressure can be caused due to low volume of the cerebrospinal fluid inside the ventricles.
Select from the following.
(a). This can happen due to a leakage of the cerebrospinal fluid from the ventricles through the meningeal membrane. Study the causes of intracranial pressure.
(b). Low intracranial pressure causes the victim to hold in the fluid, making it more likely that there is more fluid involved. Likewise, low intracranial pressure causes inflamed ventricles.
(c). That is, there is a high degree of emphasis placed on the blood pressure. However, there are extenuating circumstances, such as ongoing medication therapy, that release immaterial pressure.
(d). To get to this depth, perform 40 to 75 minutes of physical activity each day. Even walking around a corner or doing some range of motion with your ankles can help with this task.
(a).