[单选题]
At what angle should 6.-xt .(q ourzu)t34q lfhbika water-gun be aimed in ord rm a1ulbb-0o;x3 /*xbahoux 0er for the water to land with the greatest horizontal rang0x*31;x0 bubo orx/u l b-mahae?
A. $0^{\circ}$
B. $30^{\circ}$
C. $45^{\circ}$
D. $60^{\circ}$
