Someone , i'm stuck!

from the table below, determine whether the data shows an exponential function. explain why or why not.

x: 3, 1, -1, -3
y: 1, 2, 3, 4

(a) no; the domain values are at regular intervals and the range values have a common sum 1.
(b) no; the domain values are not at regular intervals.
(c) yes; the domain values are at regular intervals and the range values have a common factor 2.
(d) yes; the domain values are at regular intervals and the range values have a common sum 1.