Answer with explanation:
Asymptote of a function is a line ,that is either parallel to x axis or y axis or any line in coordinate plane ,such that distance between the curve and line becomes Zero ,when either x or y or both x and y ,tends to infinity.
For the curve ,given ,there is a vertical Asymptote, that is when x→∞, distance between curve f(x) and line , x=3 becomes Zero.
So, x=3 , is a vertical asymptote of this function.⇒Option C
Suppose,
is the given function,where ,k can be a polynomial that is single variable containing x terms only,or a constant term.

→So, For very high x-values, y becomes moves toward the horizontal asymptote.⇒Option B