The correct answer is option D) Scientists have spent years trying to determine how tsunamis can be predicted with greater accuracy.
Explanation:
A formal sentence is devoid of any slang, informal sentence structure, abbreviations or mixed language words.
In the above sentence, proper English vocabulary is used in the sentence. There is no slang words in it. Words are not written in their short forms and neither is any street language used. The sentence is structured in a very professional way and none of the words are misspelled.
1. He waft along the bridge. 2. The cat waver itself from the pine. 3. The flower weathered itself from the changing seasons. 4. Mary who is a zeal, partied all night. 5. Richard abet John to steal some money at the store.