Question

Which of these would be best to use as the basis for an Internet search of whether the levels of mercury in salmon make eating it unsafe?
A: mercury poisoning
B: Is salmon safe to eat?
C: mercury in fish
D: safe mercury levels

Answer 1

The best option to use as the basis for an Internet search of whether the levels of mercury in salmon make eating it unsafe I'd say would be option 

B. Is salmon safe to eat?

Answer 2

To determine the dangers of eating salmon which are contaminated by mercury you need to search for the dangers of mercury poisoning. This should be the first step for the research.

Question: Which of these would be best to use as the basis for an Internet search of whether the levels of mercury in salmon make eating it unsafe?

Answer: A: mercury poisoning