[单选题]
A 400-m tall tower cass b e: bq+)/x/jqfs/j0f(qu5j 5zvfz*u -ycfty/p-q* gtu5 +i2xard sts a 600-m long shadow over a level ground. At what angle is the Sun elevated above the ho*-2up gt af xi+ dtcr*y5uqy/-rizon?
A. $34^{\circ}$
B. $42^{\circ}$
C. $48^{\circ}$
D. can't be found; not enough information
