Answer:
If this is a grammar question, the answer would be A, discounted.
Step-by-step explanation:
If you put each word in to see if it makes sense, A is the only one that does. Ex:
Lets try A, discounted.
Scientists discounted the fortune-teller's method of predicting earthquakes.
Does this make sense?
Yes, but we should try the others just to be sure.
Next is b, attributed.
Scientists attributed the fortune-teller's method of predicting earthquakes.
This one doesn't make sense, so B is not the correct answer.
Next is C, contributed.
Scientists contributed the fortune-teller's method of predicting earthquakes.
This one doesn't make sense either, so let's try the last answer, D (isolated)
Scientists isolated the fortune-teller's method of predicting earthquakes.
This one also doesn't work, so the answer must be A, discounted.
Hope I helped! :)