The only reasonable answer I can see is
D. Ectothermic animals need the warmth before they can move around to hunt food.
Answer:
B modern society
Explanation:
If we still lived in the Dark Ages, we'd all be so busy farming and fighting for survival that there would be no space for leisure goods like contact lenses or developing technology like cell phones. Our modern society enables us to have job specialization: not everyone has to farm. Some people can take time to invent contact lenses. Some people can make those contact lenses.
Why not A: scientific discoveries didn't really impact rock concerts, unless you count the speaker systems. That's too loose.
Why not C: factories produce those items, but they don't directly influence their generation.
Why not D: political change has nothing to do with these items.
MS or multiple sclerosis is a condition, in which the autoimmunity of the body destroys the myelin sheath present in the nervous system. The degeneration of the myelin sheath result in the inflammation and degenerative neural disorders.
It is a long lasting disease, which mainly affects the brain and the spinal cord. it is characterized by the presence of the numbness, weakening muscles, and fatigue along with cognitive problems.