[单选题]
A convex lens has a focal le ;anr5 p2+picz.rrzw*n)t8+g y 1+l 6 d:omowckdsx-f cc8ll)ogth $f$. An object is placed between $f$ and $2f$ on the axis. The image formed is located
A. at $2f$.
B. between $f$ and $2f$.
C. at $f$.
D. at a distance greater than $2f$ from the lens.
