[单选题]
A 400-m tall tower casts a)lq l,o5us5hwi qj: m: 600-m long shado3qe+,r4eyfk fw over a level ground. At what angle is the Sun elevated above th fk +43rf,yqeee horizon?
A. $34^{\circ}$
B. $42^{\circ}$
C. $48^{\circ}$
D. can't be found; not enough information
