let f(x)=x+3 and g(x)=1/x. The graph of (f*g)(x) is shown below.

The function has a horizontal asymptote at y = 3.
An asymptote is a line that constantly reaches a given curve but does not touch at an infinite distance.
The functions are given below.
f(x) = x + 3
g(x) = 1/x
Then the function will be
(f o g)(x) = f(g(x))
(f o g)(x) = 1/x + 3
(f o g)(x) = 1/x + 3
Then we have the function that has a horizontal asymptote at y = 3.
Thus, the correct option is C.
More about the asymptote link is given below.
https://brainly.com/question/17767511
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