[单选题]
A convex lens has a fov5 pzsf1h/ )ef)h 62u)xv5axiom v+xamz+al4*/ u2hqk9q2h q k4f lddcal length $f$. An object is placed between infinity and $2f$ from the lens on its axis. The image formed is located
A. at $2f$.
B. between $f$ and $2f$.
C. at $f$.
D. between the lens and $f$.
