[单选题]
At what temperature are the numerical v3 oiq)mh87ylread4j-sm ny,hip 75ejz(bds. usx sqv+vj8, t3 i3ings on the Fahrenheit and Celsius scales t38nx u,ip smhj+z3-sdy .s5t 7v4jv(qe sj,bihe same?
A. $-30^{\circ}$
B. $-40^{\circ}$
C. $-50^{\circ}$
D. $-60^{\circ}$
