The correct answer is A.
Q: But how, also, why?
A:

Formula to the solution should explain everything. ^
I would go with C because people can also cause land pollution
Ooo that last one looks amazing!!! Plus the fruit would help if you eat it everyday haha
Answer:
precognition is retro cognition
Explanation:
When you see a specialist for a certain thing, you know that they specialize and know about a certain topic.
When you see just a regular primary care physcian, you know they know what they are talking about, but they don't know everything that could help you