Which of the following statements is the best example of a scientific conclusion?
O A. Less force is used to make a small car go as fast as a large truck.
B. A driver must use a turn signal when turning left.
C. Only people who pass a driver's test are qualified to drive.
D. In most states, the law requires you to wear a seat belt.

i'm assuming that the correct answer is indeed the first one/ "a"..

b. accuracy of the data matters alot more than its number of digits, organization or amount of detail. quantitative observation is more accepted than the qualitative observation.

the answer is:  

line graphs show patterns in data with variables that change over time; whereas, circle graphs show data as parts out of a whole (such as out of 100%).