The answer would be D. 30s (apex)
A concussion, as found on Google, is a "temporary unconsciousness caused by a blow to the head.", which means a really hard hit to the head, and then a knock out or a blackout
Some symptoms that are usually associated with a concussion can be but are not limited to: headaches, memory loss (if severe), nausea, vomiting, slurred speech, confusion, and fatigue. There can also be sleep disturbances, sensitivity to any type of change, such as air or light, and disorders of the 5 senses (sound, sight, touch, smell, and taste).
This is how vaccines are used. You introduce the antibodies in a vaccine so the person builds up an immunity and never develops the disease
The answer could be Sleep deprivation because they would loose a lot of sleep thinking about the lose
The answer is a. A nerve that contains both sensory and motor fibers