[单选题]
At what temperature 1yq g0:46sjde6o hoxsi6n u)l zb/r3 vlqxghw 0il .is0j-i:1 are the numerical readings on the Fahrenheit and Celsius scales the sameh-sgi00vr1i 3xljw/:i qz . lb?
A. $-30^{\circ}$
B. $-40^{\circ}$
C. $-50^{\circ}$
D. $-60^{\circ}$
