I think answer a makes the most sense because when you are skeptical, you tend to not accept new and different ideas that are contrary to what you think is true.
This is true. Jim Crow laws were made by people who still opposed slavery being abolished, these laws kept African Americans from exercising the rights that they were promised after they were freed.
The factors that influence when and if a person experiences symptoms from a particular exposure are :
- The amount of time you come in contact which has an effect
- The complementary symptoms that occur
