Answer:
Skeltons and fossils are main objects scientists are interested
Explanation:
By Skeltons they can take dna test which might helpful for them and fossils helps them to recognise their shape and patterns and find out why they are present in this soil and where they are present. Eg- dinosaurs
"Tragic," may work, depending if the questions is multiple choice or not.
The answer is c. A and B don't make any sense since they mean different things and also D is wrong because it doesn't meant the right thing so your best option is C. :)