Answer the Questions Based on the Phase Diagram Given Below

Answer the questions based on the phase diagram given below

-Which of the following lines in the given phase diagram, corresponds to a line along which the solid and liquid phases are in equilibrium?

A) The line that connects points B and D.
B) The line that connects points C and B.
C) The line that connects points A and B.
D) The line that connects points A and C.
E) The line that connects points A and D.