Pineapple is my favorite fruit.
Answer:
I think it is D.) Scientist have spent years trying to determine how tsunamis can be predicted with greater accuracy.
Explanation:
Words like ain't, you guys, or y'all would not be worlds you would want to put in a formal style or tone.
So, words such as determine, predicted, and greater accuracy, are formal in a way. Just think of it this way, the sentence would sound as if someone who was smart was speaking or someone who is very FORMAL.
I hope this helped you ; )
A February, 2002 report from the National Academies of Science concluded that while reproductive cloning is unsafe and should be banned, therapeutic cloning has sufficient scientific potential that it should be allowed to continue.