Internal-existing or located on the inside of something
External-belonging to or forming the outer surface or structure of something.
The correct answer is "riskiest"
"more risky" and "riskier" would create grammatically incorrect sentences, while "most risky" would be incorrect because the correct superlative form is "riskiest"
I believe the answer would be
D. It observes human nature through athletics rather than academics.
Answer:
Cost:
The cost of production goes down, and consumers will demand more of the product at lower prices.
Benefits:
Technology allows you to stay connected with the world while you are travelling. If you cannot take time off work then you can work from a remote location. Apart from that, you can keep in touch with loved ones. It makes travelling to foreign land safer as people will know where you are.