[单选题]
An object is placed 4ko0u-nsmfizzs/-q3wx7lf /8 ijvm 240 cm iiz-*) n1lk5*y lpgvfvz w+z 7hn front of a 20 cm focal length converging lens. How far is the image of this object fromfizznvg p 51-ll)yvwk7h **+z the lens?
A. $40 \; cm$
B. $20 \; cm$
C. $13 \; cm$
D. none of the given answers
