Which of the following describes the function shown in the table below?

Answer:
B
Step-by-step explanation:
Exponential function: [tex] y = e^{kx} [/tex], where k is a constant. Taking natural logarithm in both sides:
[tex] y = e^{kx} => ln \, y = ln (e^{kx}) => ln\, y = kx \, ln\, e => \frac{ln\, y}{x} = k [/tex]
In figure attached the constant k is obtained. In conclusion, the function is exponential with constant rate of decay.