How are the values of eights related in 880?

The relationship between 8’s in the value of 880 shows their numerical order in the number. In which to further elaborate we shall break down the number into its expanded form and word form: 
1.  800 = six hundred and 80 = eighty
2.  eight hundred eighty

In all honesty, there really is no “work” per say to show. mainly it’s just using the process of elimination. the question is asking which domain(s) would be the most appropriate for the function c(n). n is the number of observed vehicles so right away, 1, 2, and 3 can be eliminated.why? 1, 2 start in the negatives and therefore it is impossible to observe negative cars. so, #4 would be the best answer to the given problem.