The statement that describes a key feature of function g if g(x)=e^x-7 is B. horizontal asymptote of y= -7.
A horizontal asymptote simply means a horizontal line which is not part of a graph of a function but is vital as it guides it for the x values.
In this case, the statement that describes a key feature of function g if g(x)=e^x-7 is that the horizontal asymptote of y = -7. This can be seen from the equation given.
Learn more about asymptote on:
https://brainly.com/question/4138300