Determine a Formula for the Exponential Function $y = 0.45 ^ { \mathrm { x } }$

Multiple Choice

Determine a formula for the exponential function.
-The graph of an exponential function is given. Which of the following is the correct equation of the function?

A) $y = 0.45 ^ { \mathrm { x } }$
B) $y = 0.31 ^ { x }$
C) $\mathrm { y } = 1.8 ^ { \mathrm { x } }$
D) $y = 2.4 ^ { \mathrm { x } }$