If you added 253 grams of table sugar (C, H,02) to a recipe, how many oxygen atoms did you add?

Where's the pictures ?

They are like other investigations? say there was a murder u have to do blood test and finger prints which run through a lab. 

There is no reason to think the results are biased or not conducted properly but you should not assume the results are correct just because they were done in a laboratory so the answer would be c. it is likely to be reliable because the results support the conclusion presented.