An object travels along a straight, horizontal surface with an initial speed of 2 . The velocity of the object as a function of time is given in the table above. Which of the following graphs represents the object's acceleration as a function of time?

Independent variable is something that is changed in a experiment. 

The best answer is (a) which is universal law is in effect at all times. it is constantly at play in everything we do and governs our lives. it is also important to note that universal law applies to not only everything on earth, but everything in the universe as well, which is another reason why it is in effect at all times.

If its history of, then b) because a) implies only present day (now)