Answer:
Explanation:
The answer should be D. I believe here are always a certain amount of risk involved in human relations, that is because human behaviour is not a 100% predictable. Even if there are big schemes of human personalities, so many little things can vary.
That would be 'present perfect'.
Past perfect would be 'had seen'.
There is no such tense called 'present past.'
C. the politics of food revolution.